Hey @jadams2k18,
thanks first of all for your feedback. The reason why some categories disappear in time is due to our account analysis. We use your activity (voting/posting) over the last 100 days to create your profile. What's special about this is that it looks at your account backwards, so your latest activity is seen first.Therefore, it can happen that the ranking is initially correct and deviates a little in the course. This is especially the case when you shift your interests; similar to how you described your change.
Nevertheless, we have added your objection to our list and will try to provide a solution soon! Thank you😀