How to Scale Decal right without Scretching?

Hello UE Forum,
I have the Problem that i wanna make a Monitor Picture. So I took a Image und createt a Material but when i use it as a Decal in my Blueprint it doesnt Scale right its Scretching a part of the Picture and i dont know how to fix it. I found a yt Video but that didnt help me. I even tried to downscale the picture but it doesnt help (Normal P2, Downscaled P7…)
To see my problem i uploaded a video: