Why am I not able to step through my code in R? - r

I'm just trying to step through my R scripts for debugging and I noticed that I wasn't able to go line-by-line through code. I have an attached pic of my screen.
This shouldn't be happening. Any help is appreciated.
Thanks.

https://support.rstudio.com/hc/en-us/articles/200484448-Editing-and-Executing-Code
To execute the line of source code where the cursor currently resides you press the Ctrl+Enter key (or use the Run toolbar button):

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see this
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