When it calculates how many tracks should be in Other, it trims the categories (a "category" is, e.g., an artist - it varies for each tab) to the required maximum categories. Then, the amount of tracks in Other is calculated by the amount of categories trimmed off.
This is obviously wrong, because each category would almost always have more than 1 track. This takes place here and should be a fairly trivial change to make. (Note: the use of "\0\0" as a category string means "Other", and is to prevent collisions if there is an artist called "Other")
bug help wanted