Text Fields Have Gone Missing After Merging Docs in Acrobat Pro DC

Hi. I'm very new to Acrobat Pro DC, so this might just be something stupid I'm doing...

I've converted a few MSWord docs to Acrobat and then combined them. I've then created many text fields throughout the new combined document, some of which were copied from an original text field I created at the top of the dcoument, keeping the field name the same so that when the text is entered at the top of the combined doc, it feeds through the document to the several other places where the same info is required.

All worked well so far. Then I converted another MSWord document and combined it with the first combined document - suddenly many of my text fields have gone missing! Particularly the ones that were 'copied down' in the first combined document, but also several checkboxes and date dropdowns.

The weird thing is, when I use the 'Organize Pages' tool, I can see those fields in the thumbnails of each page, with test text that I had put in there, like nothing's wrong. However, when returning to the main view, they're missing.

I hope the above makes some sense to someone who can help me. It seems that I may have lost several hours worth of work. Thanks in advance for any help.