IMO lifting shoulders and chest in the same day is counter productive. If you go heavey on chest your shoulder movements will suffer and vice versa.

But in this instance I would say your diet may be the culprit, or perhaps your coming down with something and you dont realize it yet.

__________________
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.