Weird damage and desync

Hullow guys. I just wanted to ask if any of you have the same problem for me it started getting worse after two weeks back. So i get into cascades loot find a peacekeeper and a p2020 and a shield then i ran to help my team who was getting shot. I get into a house with 2 enemys and i shot lifeline first with the shotgun said i did 102 dmg HS (she didnt have a shield) i see she is still alive so i chase her down while she wasnt healing i did 2x 24 dmg with a p2020 and she was finnaly knocked then Octane came i did a HS dmg 96 and another 30 dmg with the next body shot also no shield and well he killed me in tottal i did around 300 dmg to two people with no shield and they didnt die how?!. Yesterday similar situation in airbase i did way more than 175 dmg to a guy with the blue shield and when he killed me i saw he still has half of his life even tho he should be dead. When i died i saw my damage it was 202 so even if he would have a lvl 3 shield he should die right? Also i have died behind a wall or a rock soo many times in the past few days i have no idea what is going on.I run into cover and when i am 100% sure i am hidden so i can heal i die without even getting shot. Desync makes me rage 😒