Hello EvaFrise,
There is some more information I would like to from you in order to better understand this issue.
1.) You are saying the second picture is in game. Is that playing in editor or launching to standalone?
2.) Can you link a screenshot of the material you are having this issue with? Also can you link a screenshot of your post processing?
3.) Can you link a copy of your DxDiag?
4.) Does this happen in 4.9?
After I have this information I should be able to narrow down what is causing the discrepancy between editor and game.