Multiple Bootstrap modals on the same page - css

Question

I am working on http://steam-to-rent.ch/mietdampfanlagen.html. As you can see I am using Bootstrap collapse and when you click on the "Anfrage" button it's displaying a Bootstrap's Modal. The problem is that when you click on the second "modal button" (Anfrage) and then you close that modal the background overlay color remains and I can't interact with the page. How can I solve it?
This is the code
<button type="button" class="btn btn-primary special"
style="background: #fadf3e; border: 2px solid #000; color: #000; margin-bottom: 20px; margin-top: -10px; width: 100%;"
data-toggle="modal"
data-target=".bs-example-modal-sm">Anfrage</button>
<div class="modal fade bs-example-modal-sm" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<h4 style="color: #000;">Mietdampfanlage 21 kg/h 10 bar</h3>
<div class="col-sm-12 form">
<form class="form-modal" role="form" method="post" action="index.php">
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-12">
<input type="text" class="form-control" id="name" name="name" placeholder="Vorname, Name" value="">
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-12 ">
<input type="text" class="form-control" id="name" name="firma" placeholder="Firma" value="">
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-12 ">
<input type="email" class="form-control" id="email" name="email" placeholder="E-Mail" value="">
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-12">
<input type="text" class="form-control" id="name" name="telefon" placeholder="Telefon" value="">
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-12">
<input type="text" class="form-control" id="name" name="zeit" placeholder="Zeitraum" value="">
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-12">
<textarea class="form-control" rows="4" name="message" placeholder="Nachricht"></textarea>
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-12">
<input id="submit" name="submit" type="submit" value="Send" class="btn btn-primary">
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-10 col-sm-offset-2">
<! Will be used to display an alert to the user>
</div>
</div>
</form></div>
</div>
</div>
</div>
Edit:
<button id="modal_1" type="button" class="btn btn-primary special" style="background: #fadf3e; border: 2px solid #000; color: #000; margin-bottom: 20px; margin-top: -10px; width: 100%;" data-toggle="modal" data-target=".bs-example-modal-sm">Anfrage</button>
<div class="modal fade bs-example-modal-sm" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<div class="row">
<div class="col-sm-12 form">
<div class="modal-header">
<h4 style="color: #000;">Mietdampfanlage 21 kg/h 10 bar</h4>
</div>
<form class="form-modal" role="form" method="post" action="index.php">
<div class="col-sm-12">
<div class="form-group">
<input type="text" class="form-control" id="name" name="name" placeholder="Vorname, Name" value="">
</div>
</div>
<div class="col-sm-12">
<div class="form-group">
<input type="text" class="form-control" id="name" name="firma" placeholder="Firma" value="">
</div>
</div>
<div class="col-sm-12 ">
<div class="form-group">
<input type="email" class="form-control" id="email" name="email" placeholder="E-Mail" value="">
</div>
</div>
<div class="col-sm-12 ">
<div class="form-group">
<input type="text" class="form-control" id="name" name="telefon" placeholder="Telefon" value="">
</div>
</div>
<div class="col-sm-12 ">
<div class="form-group">
<input type="text" class="form-control" id="name" name="zeit" placeholder="Zeitraum" value="">
</div>
</div>
<div class="col-sm-12 ">
<div class="form-group">
<textarea class="form-control" rows="4" name="message" placeholder="Nachricht"></textarea>
</div>
</div>
<div class="col-sm-12 ">
<div class="form-group">
<input id="submit" name="submit" type="submit" value="Send" class="btn btn-primary">
</div>
</div>
<div class="form-group" style="margin-bottom: 15px !important;">
<div class="col-sm-10 col-sm-offset-2">
<! Will be used to display an alert to the user>
</div>
</div>
</form></div>
</div>
</div>
</div>
</div>

Answer 1

data-backdrop="static"
data-keyboard="false"
first look and see if there is data-backdrop="Static" anywhere. That would do it. Also make sure data-keyboard is NOT false just to make sure you can interact.
Last I want you to look at the the ID's on the buttons and modals. make sure they are all different. I dont see an ID on this modal here so I would suggest something like
id="modal_1"
on the button AND the modal. Make sure it matches