Process Panel Incorrectly Shows Code Changes When Nothing Was Changed

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When the original source code contains an element with both the "btn" and "btn-default" classes assigned to it, the converted output section correctly leaves it unchanged (since having "btn" and "btn-default" on an element is correct in Bootstrap 3). However, the Process panel on the left side of the screen, in the "Changes to Button Color Classes" section, it incorrectly says that there has been a replacement. I am including a screenshot that shows a simple example. You can see the input source code and output source code are the exact same, which is correct, but the Process panel shows that 1 replacement was made, which is incorrect (I added a large red arrow to the screenshot pointing to the element exhibiting the bug for emphasis).

This problem only occurs with "btn-default". When the input source code has another button color specified (e.g. btn-info, btn-primary, btn-danger, etc.), the program functions correctly and the Process panel correctly shows that no replacements have been made.

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This also happens with the form-control class:

<input type="text" name="foobar" id="foobar" value="" class="form-control">