Hi munirsoares ,
Please provide the exact dot version of the software & OS installed at your system .Also check whether is there any update available for the software after going through "help > check for updates "
Follow this thread to reset the preferences for the Acrobat software:- How to reset Preference settings in Acrobat.
Is this happening with this document only or others as well .
Refer to this KB article :- Compare two versions of a PDF file in Adobe Acrobat.
Also check with the different user account to replicate the issue.