The bags are plastic remember. If they are loaded they can spead out a bit. I am not saying this is the problem you are having, but I do know with my bike if I tend to overload the bags I have to take my knee and push in on the side, flex it inward to get the lid to close.... A side note. Get some black silicone and put it in the hinge holes on the ends of the lid, this helps keep the pin from coming out of the lid. Jamming on here recently lost one of his hinge pins. Somebody mentioned this trick on this website a long time ago. I got some good black silicone and used if shortly after buying the bike and have not had any problems with the hinge pin coming out. Also some people get rid of the twist bolts(duetz) that hold the bags on and install regular bolts, so the bags do not fall off or get lost as easy.
Buckeye, Arizona(USA) 2011 Victory Cross Roads, Black police bag guards, black engine guards, black handle bars, Triumph Tiger mirrors, Triumph hand grips, set speedo/tach back 5" , adjustable timing wheel, Lloyzz Fuel Programmer III & air filter. Modified exhaust, made stock into 2 into 1. MRA windshield, Rotated front fender forward,relocated ignition switch, Bad Ace Fuel Tank Risers, Fat front tire.