Unable to select multiple checkboxes

I created a pdf from the current version of InDesign. I open in Adobe Acrobat Pro DC. I use prepare form to add fields to include checkboxes. It does all this but will not allow me to select multiple checkboxes and at some point won't let me select any checkboxes. The boxes have been placed manually in InDesign (did not use Zaph Dingbats though I would prefer to).

I have uninstalled and reinstalled Acrobat. The pdf is the print version. It is not PDF/A.

I do not work in any kind of code so adding scripts will not work for me. And no clue how to attach the file with a link.

Suggestions?

Thanks! Rhonda