Invisible note skews part

WeirdMeter.dorico (795.5 KB)
This is imported from Sibelius via XML. In measure 10 the 3rd part is offset to the right by one eighth-note and continues thus until the end of the flow. I would normally handle such a situation by a combination of deleting and an appropriate use of the insert function. But here there’s nothing to delete. The top two parts are correct (except for the hanging rests at the end of the flow).
Can anyone tell me what’s going on?

It’s possibly something askew in the XML file, but to correct the third part:

Set the rhythmic grid to an eighth note, select the first note of the third part in measure 10, shift-click on the last note in the third part, and press alt-opt+left arrow.

Edit:
To show the “missing” eighth rest at the start of measure 10 in the third part, select the half rest in measure 9 and press delete, or select the half rest and disable Ends Voice in Properties.