When tagging text fields in Acrobat X Pro, sometimes separate bodies of text merge together into one, especially when changing the reading order.
Even when the text boxes are clearly separated, Acrobat like to merge them together, an action which cannot be undone for some reason. This makes editing reading order extremely frustrating on some documents and take far longer than necessary. Furthermore, when selecting text to tag as 'text' under the reading order panel, the selection box for each character often has a huge line height compared to the actual character. Is this what is causing the text fields to join?