I just turned in ~180 coins while I had (obviously) over 100 items in my inventory. Confirmation message said I'd turned in 0 coins from my inventory. When I clicked to return to the shop, however, the # of coins available to spend had updated (correctly as far as I can tell, if it's off it's off by like 2-4) and the coins were properly taken from my inventory.

Minor, but caused a brief moment of panic. On Chrome. Also not 100% if this should be event or site functionality, so feel free to move as needed.

Edit: Just tested with some Steamworks Trinkets (same scenario, took out enough to be >100 items in inventory jic that's relevant then turned them in) and it worked properly throughout.

Ah, yeah that could certainly be it. Didn't occur to me, oops. Feel free to lock/dismiss.

Locking per OP request