This is so weird. When I have a few things in my trunk it won't shut and Beep and reopens. It will shut but will beep and pop open. Is there a sensor issue? When I unload the trunk it will shut fine. And I only put a few things in there. Ideas??

 

What you described is how the trunk release acts when there is a key fob placed in the trunk. The trunk pops open to prevent keys from being locked inside. By any chance, were any of the things you were placing in the trunk have the extra key fob inside?