Maybe there is some debris stuck between the plastic housing parts of the head? Because they obviously do not fit together: there is a huge gap in the last photo.
I would suggest you search the manual on how to disassemble the head and nozzle on the UM-site, and on Google. I think there are also tutorial vids on Youtube. So you have multiple viewpoints.
And then remove and carefully inspect the black plastic parts?
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TheodorK 11
for a quick fix, you could wrap some electrical tape around the bearing (to make it thicker) and then reinsert the bearing arter loosening the screws, than the bearing might just stay in place.
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