It's possible to have two currents for a string.

[NekoJonez]

https://translate.wordpress.org/projects/wp-plugins/events-made-easy/stable/nl/default/?filters%5Bstatus%5D=either&filters%5Boriginal_id%5D=12843760&sort%5Bby%5D=translation_date_added&sort%5Bhow%5D=desc&historypage

I can't tell you why this occurs, but I have seen various plugins, especially plugins with 1k+ strings where a string can have two currents.
Currently, I use https://github.com/vlad-timotei/wpgp-tools and the history setting to find these and delete them. But there should be some check in place for this.

How this check would look like, I have no idea. Maybe display a warning symbol when translated > all? Display it in another style (maybe not another color, since color-blindness is something that exists)

[ocean90]

Noting that this happens on translate.wordpress.org and was previously reported in https://meta.trac.wordpress.org/ticket/5976.

[abrain]

This happened to me as well when the original strings only changed a tiny bit (changed placeholders from %s to %1$s) and translate.wordpress.org offered fuzzy translations for those. I either accepted or saved those, cannot tell for sure. I am a PTE for the project.

I also found the "two current strings" issue in another locale of the same project for strings where a URL changed in parts. Might have happened the same way, I am not a PTE there. See translation history.

[psmits1567]

This week I had the same problem with a project post-expirator. It show different values for translation
https://translate.wordpress.org/projects/wp-plugins/post-expirator/stable/nl/default

And here is the one creating the problem

[NekoJonez]

How shall we tackle this in the best way? Since very rarely this issue still pops up.
Should we post the links here and not fix them so we can investigate?

Besides that, how can the translators know that there a duplication happened? I think it would be too expensive to have a scan running that checks all projects that aren't 0% and somehow adds them to the "waiting" for GTE/PTE's with some sort of warning?