Every time I do deadlifts I get picked up by a PT at the gym for rounding my back. I have no idea I'm doing it so I don't know how to stop it. I look up, keep my back straight, chest out, shoulders back but every time I get told I'm rounding my back, now they've told me I need to lower my weights so I'm at 35kg instead of 60 last week! I'm really starting to get upset and pissed off, can anyone please help me out? Thank you