Trail Of Sekhemas

I keep getting one shotted? By anything like from a single trash mob to the boss one shotting me from a wack etc While i still have health or when I get hit and look at my health globe and I apparently still have health and my health globe did not deplete to zero and totally lose out on the trail and have to return to character select and restart the trails all over again for the 5th-6th time now. First time posting so I do not know how to add images.