When I’m in ROBLOX Studio with R15 Rigs made using the Default Rig Creators on the Avatar panel, and add more than 2 accessories, they start to shrink infinitely and I have no Clue what I’ve done wrong for this to happen, I’ve tried restarting Studio & Restarting my PC.
I’m converting an old Demo from R6 to R15 for the release build of a game, and I’ve only had this problem with the accessories shrinking today. I’ve attached a YouTube video to show the problem.
just letting you know, i think your in the wrong category as your in creations feedback
ROBLOX wouldnt let me post this in the bugs section of the forum for some reason.
Didnt know where else to post it
I’d put it in Building Support :>
did you resize the accessory in studio? that happens to me when i do that
I’ll try that if this gets nowhere
the accessories were freshly picked from the marketplace, I hadn’t changed a single bit of them.
I woke up today and it’s magically stopped being an Issue from what I can see ;-;.
I wanted to leave an update on the issue just in case anyone else comes across this having the same problem, some accessories still cause the problem and it seems to be something to do with the R15 and how it manages multiple accessories in the same place.
The problem I had fixed itself as I left the accessories on a R6 model temporarily, and then moved them to the R15, I didn’t realise this until just recently. The R6 rigs seem to fix whatever property of the accessories is causing the shrinking on R15 as when I move them from R6 to R15 its completely fine.
The way Members have to get Bugs added to #bug-reports is you send a message to @Bug-Support detailing the Bug, and how to reproduce it,
and then if they deem it an issue, they will move your message to #bug-reports in the appropriate section, under your username. 
Hope this issue gets fix for your sake!
Ohhh yes I remember now, when I first tried fitting my accessories they were always having weird issues like this, but yes R6 is the way to go!