Openapoc: General Store Space Change inverted when selling

[Quickmind01]

After the latest change, it appears the percentage available changes inversely to what is actually happening. For instance, I started at 82% available space, but when I sold 80 vortex mines, my space went up to 87%. When I went to the base screen, my percentage available was 77% in the General Stores. When I went back into the sell screen, the percentage was correct at 77%. Please see saved game and test in Base 1. This is after I fixed all of my ammo numbers. This appears to be a minor bug, in my opinion, but can be confusing for a newer player.
save_Stream Test.zip

[FilmBoy84]

Confirmed, this does appear to have been introduced recently

Assigning to JonnyH as he knows better than I what has changed

Also may be worth tacking issue #336 (now not just limited to autocannon AP, but HE and some other items also) whilst we're at it

There's a host of equipment errors in OA at the moment relating to storage.

[Quickmind01]

In case you want to see the video for it: https://www.twitch.tv/videos/459284154