I cannot replicate it resizing the columns within the internet radio back to showing if I've sized them to effectively not appear & had checked that it would save them as zero width before I'd made my reply. If something like the Ctrl+Shift+Numpad Plus action is done to trigger a resize based on the column contents then it's going to show the columns again as that's expected per how the listview is done in other parts of Windows.
If it's not saving their width when you're closing wacup or even just switching to another view & back again (does that behave for you or does it also break?) then my assumption would be something is either preventing the config from being updated or it's not being read back in on loading or something is triggering the column resize action (it's not something I've coded it to do as that would annoy me & is why all of the views be it this or local library, bookmarks, etc will attempt to maintain the last set width) which again I cannot currently replicate with 23528 in either of different x86 & x64 installs.