Text Changing to previous page
at the same location from previous page when selecting a text block and try to highlight it, switches to previously highlighted text in previous page and change the whole text block to that previous text.
if ( Text in page 2) highlighted it will change to (text in page 1) in order to reverse this need to change the page and back again until it works
also, the selected text disappear after finishing from selecting along with the options that appears after selection.
Abdulaziz Zarban commented
Using Adobe Acrobat 20v
Macbook air (early-2015) macOs Catalina 10.15.3