Tailwind issue - some items are slightly off - tailwind-css

Question

Not sure how to debug this, but inspecting some items that are supposedly inside a flex, they are still off by a few fractions of a pixel.
On the screenshot below, notice the slight variation between the Id / Due Date and the Project input fields. https://imgur.com/a/je3Sgiu
What could be the issue here? I tried it in Firefox, Safari, and Chrome, all facing the issue.
Edit:
Added the html snippet below
<div class="lg:w-4/5 mr-auto ml-auto mt-16 sm:px-6 lg:px-8">
<div class="">
<form method="GET" autocomplete="off">
<div class="md:flex">
<div class="mx-2">
<label class="block uppercase tracking-wide text-gray-700 text-xs font-bold my-5" for="grid-state">
Id
</label>
{% render_field invoice_filter.form.id class="w-full lg:w-40 block appearance-none bg-white border border-gray-500 text-gray-700 py-3 px-4 pr-8 rounded leading-tight focus:outline-none focus:bg-white focus:border-gray-500" %}
</div>
<div class="mx-2">
<label class="block uppercase tracking-wide text-gray-700 text-xs font-bold my-5" for="grid-state">
Project
</label>
{% render_field invoice_filter.form.project class="w-full lg:w-40 block appearance-none bg-white border border-gray-500 text-gray-700 py-3 px-4 pr-8 rounded leading-tight focus:outline-none focus:bg-white focus:border-gray-500" %}
</div>
<div class="mx-2">
<label class="block uppercase tracking-wide text-gray-700 text-xs font-bold my-5" for="grid-state">
Due Date
</label>
{% render_field invoice_filter.form.due_date class="w-full lg:w-40 block appearance-none bg-white border border-gray-500 text-gray-700 py-3 px-4 pr-8 rounded leading-tight focus:outline-none focus:bg-white focus:border-gray-500" %}
</div>
</div>
<button class="whitespace-no-wrap mr-5 bg-green-600 hover:bg-green-700 text-white py-2 my-2 mx-2 px-6 rounded-lg" type="submit">Apply filter</button>
</form>
</div>
</div>
The {% render_field ... %} tags are just a Django specific way of adding classes to the form fields,
It essentially says
`<input class="...." />`