Planar reflections acting wierd when rendering

Hey,

I am fairly new to UE and I’m working with archviz. I have a problem with the reflections on one of my windows when I render it for a single frame and I can’t really figure out what the problem is. It looks alright in viewport mode, but in the finished render the reflection looks stretched. I’ll send over some screenshots so you can see the problem and hopefully get some help.

Here I took a screenshot so you can see how it looks in the viewport mode, fairly ok for what I’m looking for.

And here is how it looks when rendered.

Advice/guidance would be much appreciated, thank you!!