Hope you are doing well, and sorry to hear that.
Is this an issue with a particular file or with all the files? Please try with a different file and check.
What is the workflow/steps you are doing to create the PDF file? A small video recording of the same would be very helpful
Also, please go through the help page https://helpx.adobe.com/acrobat/how-to/create-pdf-from-any-document.html and see if that helps.
Marking a reply or response “Correct” will help future users with the same issue quickly identify the correct answer.