Hi @SoenkeS , and welcome to the Forum, and to Dorico!
I don’t know what caused this nested tuples in the conversion, but is very easy in Dorico to correct this:
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activate insert mode (voice scope):
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select with command (control) +click the nested “3”, press delete
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select the note and the rest that was in the first two nested triplets, press 4 to transform them to sixteenth note/rest
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make the same for the next note/rest (originally the nested triplets)
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remember to deactivate insert mode !
Here a short video of the process (takes only 15 seconds or less):
