Many msoffice functions are missing here as well as display errors such as typography and animations, which I hope can be improved.
I have made several documents with which you can compare:
docx xlsx pptx
Thank you for the files provided.
We are already working on most of the display problems.
I will notify you when I have something to share.
Hey, @for_the_zero
Please specify the following information:
- Which operating system you are using?
- Did you create these files yourself or have you made changes to a template? (non-standard page size in a .docx document)
- Which editor did you use to create these files (MS Office version)?
- Which version of ONLYOFFICE editor are you using?
Thank you once again for providing the documents. We are grateful to you. 
- win10 1909
- myself
- ms 365
- newest
Thank you for the clarifications.
We continue to work on the problems in the attached files.