Opacity overlay half cut randomly
Hello,
I'm not quite sure how to explain this properly as this is a bit of a strange problem and I couldn't find similar cases in the forum.
Basically, I put an image on top of an other one and turned down the opacity to just see it on transparence but when I do that the image on the top just cut itself in half in a random place and the effect I want to apply on the whole frame only works for half of it or so. Individually both images are completely fine, I did not apply any other effects on them. So I don't know if this is an options I clicked on by mistake but it's the first time I'm facing something like this and I can't explain it.
Here is a screen shot (opacity turned back to max so you can clearly see the cut)

Does anyone have an idea or knows what this is about?
Kind regards,
Matthias.