PDF crashes on markup

I own an iPad 9th Gen. I have been facing an issue while I markup on the PDFs in Files. The PDF refreshes itself as soon as I draw anything on it. Sometimes I am not even able to close it because it is in a constant loop of refreshing itself. My files are in iCloud but I tried moving them into the internal storage and annotating but the issue still persists. Also this is happening only with a few of the PDFs.

It would be really great if someone could help me out.

Thanks