I was trading this guy who was begging for my Native American Headdress (I crossed out his name because I don't think he wants me to show him begging to everyone lol) and I added 6 hats to see if he liked any of them and it said I can't have more than 15 items or the item couldn't be offered. Lol I thought it was weird but pretty funny.

Thats not a bug. That means you tried to put more than 15 items in the trade box. You can only put in 15 items.

I only put in 6 things and the arrows are faded.

Everything is faded...

You know how the arrows are faded because you have nothing to scroll down to? Yeah thats what they were doing becasue I only had 6 items. It's a bug.