I don't know if this has already been reported, but I'm running the latest v2.2.1 beta. I decided to delete all of the rigs on my KPA except for my favorites, and then reload just the rigs that I think I'll use in the future.
I started out at the maximum number of rigs (1000) and performed the "delete non-favourites" function. Then I inserted a USB stick in the KPA and attempted to perform an "import". The KPA displayed a message that said I was at the maximum allowed and wouldn't import the rigs on the USB stick.
I powered off the KPA, powered it back up, and then I was able to import the rigs I wanted.
This isn't a big deal, but when rigs are deleted the total count should be properly adjusted.