Under the "Colored sub-forum boxes" option I have the following selected: Don't show sub-forum icons. It has always worked properly however now when it loads page two using the dynamic topic lists the colored sub-forum are showing up. Attached is a picture and the behavior is the same on my phone as well.
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Your browser/os information:
Mozilla/5.0 (Windows NT 6.1; rv:55.0) Gecko/20100101 Firefox/55.0 (this will help us make sense of your bug report)