I suppose you are facing this with a particular set of PDF’s. Can you please provide one such PDF. Also please provide the version of Acrobat you are using.
Paramjeet Yadav commented
Are you facing this issue for all files or some specific pdf files? If you're facing this issue with some specific pdf files, then please share one such pdf file with me at firstname.lastname@example.org.
Also please share the version for Acrobat.
Steps to know version of Acrobat:
Go to Help -> About Adobe Acrobat Pro DC. A window would pop up containing version number. You may send us snapshot of the pop up window.