Ok probably is the excessive bicep work. so, for now, stay away from dislocates a bit and stop the additional work for the biceps.
Stretch on a bicep with additional weight is useful only if there is a very good bicep strength, but this is valid for all the muscles....weak muscles cannot be subjected to weigthed mobility and your bicep is one of these weak muscles. the weighted mobility has probably the greatest amount of connective tissue damages....so as you can see we have finally found the problem.