This is because we put a limit on how much the Free Shop shows at once, and it looks like this limit erroneously affected all shops. I will fix this, thank you for bringing it to our attention. :)

Whoops!! That was a statement I put in there while debugging. I've gone ahead and taken that out now!

Basically, the shops were getting a bit too full sometimes - full enough that they weren't even able to show all of the hundreds of items - so I have put some code to check when they get too full and just clear some random items when that happens. So the overflow problem should also no longer happen here.

(I could have also "fixed" this by allowing the shops to show ALL their items, but... as we saw with the Free Shop, we have to put a limit on this, because when you have a single webpage show like 1000 items at once, it might crash instead of loading them all.)