probably doesn't work when you have a harmony on. delete your harmony and try again (tell us again when you test it).
that 1buff isn't equal to all your buffs. over the body works only if you doesn't have any +hp buff or +hp buff have to be not greater than your buff.
dont give false info,titans could always stack it with battle roar....so hp buff are not the issue. over the body always worked as a prophecy-cov-vop,not btb/hp buff,so your assumption is wrong.
and this isnt a discussion section guys so please stop flooding here and the team will look into it and confirm if there is a bug or not. regards.