"Jakmile otevřela ústa, začala si stěžovat."

Translation: As soon as she opened her mouth, she began to complain.

[ion1122]

I wrote "As soon as she had opened her mouth, she started to complain." This was not accepted, but it should be

On the other hand, the "correction" I received was "As soon as she has opened her mouth, she started to complain." That is not grammatical. It must be "had".

I've reported my answer as correct.

[nueby]

I wouldn't make a huge deal of it; reporting is enough. They are adding translations. Also, if you can prove that present perfect is truly ungrammatical, do so; otherwise you will be ignored. The criteria for adding translations are not burdensome, but nobody is eager to remove translations on a single person's say-so. A reference to a recognized text or a well-reasoned use of ngrams will certainly be considered, although marginal use may still be tolerated in side translations.

[sir_dejf]

...had opened... still not accepted.