When editing a text frame the displayed text was overlayed onto the previous text (instead of replacing it). This file was then saved and Publisher closed. With Publisher restarted and the file reloaded the same overlayed text was displayed. This also occurred even after the computer was restarted. Screen shot of displayed text and copy of saved file is attached. This happened at the end of a lengthy editing session, so not able to recreate the exact circumstances. Just prior to the problem the text frame with the problem had been copied, the copied frame edited and then further text editing done on the original frame, which corrupted the original with overlayed text. The lines of text in the original frame that followed the point of editing (item 4 on the screenshot) also seem to have been duplicated, but offset by one line. Further editing on the saved file causes more overlaying.
Affinity Publisher
Beta version 1.7.0.257
Mac OS version: 10.13.6
Chess clock guide for KK9908.afpub