when looking at 180 my fps drops

this is the most weird problem i have ever had, when i look at a certain direction the fps drops from 70 to 20, i don’t even know what to say, and it doesn’t matter where iam in the map, even if i go far away from my spot and look into that direction my fps will drop, the direction is (180) and thats when i look behind me so its not a single place that i look at, and if there’s any kind of an object there the fps will drop, but if there’s nothing the fps wont drop, so it doesn’t matter where iam, if there’s an object in that direction my fps will drop.
this problem is so ilogical that it has to be an engine problem,
if anyone has an idea it would be appreciated.