Why does the first line of code indent if the code has syntax highlighting?

I am using the Code Syntax Block plugin for WordPress. I am using a WordPress version and PHP version that meets the minimum required verion for the Code Syntax Block plugin.

Whenever I use it the first line of code (be it Bash or whatever) has two leading spaces. When I am editing it, there is no sign of a space. How do I eliminate this double space?

For example, I want the code to appear like this:

#!/bin/bash
echo "test"
echo "line 3"

But it appears like this:

  #!/bin/bash
echo "test"
echo "line 3"