I am completely out of ideas on how to resolve this problem to be honest and the forums is my last resort.
When I run PAC is registers these (see images below)
PAC reads them as 'text object not tagged'
The problem is, I've already tagged this text. I've also tried searching if it's an unmarked Link, Annotation, or Content but it wasn't found.
I even tried Preflighting fixes but PAC still reads it as 'not tagged'.
Any ideas on why this is will be greatly appreciated.
Have you tried taking a look in the Content pane, to see if any text objects are hanging around outside of containers? If you find any - and they are not real content - artifact or delete them.