In the normal shops there are only supposed to be a max 16 item limit. My shop is able to hold 20 and possibly more if I didn't open store while it went past the limit. Note: I counted afterwards because it was suspicious and didn't notice while putting it up. ( No Editing/Hack Programs in case you suspect )
Youll notice though that no one can buy anything after item 16. Iv had this bug before, you need to remove all the unglitched items, then once you have less then 16 item youll be able to remove the other ones, you can then close your shop, reopen and it will fix it.
Be careful with this glitch because I've had this happen to me and I couldn't open back my shop up despite getting all my items up. I eventually had to ask a GM to help me close up my shop in order for me to open one back up.
With all your warnings of what would happen, it didn't d/c anyone that I know of entering the shop and was able to sell things perfectly fine. I was also able to put down then up my shop with ease without GM help. This was also without removing glitched items to make it less than 16 items.
Actually, you werent able to sell things past the 16th slot. A friend of mine was trying to buy Bow attk scrolls from your shop but was unable to. o: