SDL Trados 2019 target segments suddenly populated with source text - need to clear the unconfirmed segments

Hi there, 

As the description states, my target segments are populated with source text and it's horribly annoying to have to clear each segment now first. Is there a faster way?

I did a pretranslate batch task, but only for 100% matches, and auto-propogate is only on for 100% matches.

What happened?

Thanks!