Not sure if it helps but I had serious problems with duplications of boxes and cats and I mean many many when I was on a homestead.
This went so serious I left the homstead as I ended up with a shop which was hard to maintain.
This was in the time they did rolling restarts almost every day and I ended up with so many cat and box duplication I got a little paniced LOL
On an other full sim I owned cats and boxes as well and it never happend there while the rolling restarts happend very frequently there as well which left me with the conclussion Homesteads have such poor performance the connection they make with the KC server knows delay why this happened.
If this might be the case with you the problem could also be Linden Labs gives a too poor performance to have cats/ gems in a satisfying way.
Not sure if that is the fact with you ofcourse but I thought it was worth it to mention my past with a Homestead just in case this was the fact.
EDIT In my case I doubt even if this only happend when there was a restart and not just spontaniously because I needed to delete duplications every day it was a weird situation on that homestead for sure
why i have got same number of Jewel many many time.
