Why does some CC cause this to happen?

Nature of code. My area isn't gaming software, but I can tell you that on web design, sometimes all it takes is one little error, missing item (even as small as one character), or incorrectly written line/item (redundant to 'error') to mess something up in how it presents (to various extents) and sometimes to take it down entirely. It's possible there's an error in the CC. Or that other coding in the software has been updated/changed in a manner that is now conflicting with the original CC. Maybe you could re-download the code at the source/creator's site. There's always a chance that yours somehow became corrupted or that this is a known issue (or an update conflict issue) and the creator has uploaded a corrected version.