Did 120mm DM23 bad?

My Leopard 2A4 hit Type 90’s side and causing 0 spall and no damage is normal? I don’t really know because I got some bloodline curse (maybe🥲) which having huge problem with the Germany tree, every weapon at Germany tree in this game is just not working to me, from 75mm, 88mm to 105mm,120mm they just don’t do a lot of damage in my hand and it isn’t “skill issues” because I have not problem to those weapon at other tree🥲