Date and Time: 11/1/2022 9:49 PST
NPC Involved: Excitable Explorer <Granary>

Steps to Reproduce:
1. Hold almost 999 of one item from the Isleventory. I did this with 989 island stones.
2. Since the cap for any item in the Isleventory is 999, if you attempt to accept an amount that would put you over 999, you would only get some of the items.
3. In system messages, the numbers for the possible and actual received amounts is flipped.

For example, the text that appeared for me was
"You obtain 12 of a possible 10 island stones due to a stuffed isleventory!"