Chamber Fan Stuck

Got a P1S, and have had a great time with it. I received some notices about the part fan stuck etc. No problems after a little research found what to do. that lead me down a bigger rabbit hole. After watch a great video on the 3 fans. The video also had sound which you could hear as they test each fan. I then notice that the Chamber fan switch would never turn on and did not hear the fan like the video. After a removing rear cover found I could not turn the fan. removed fan to inspect. Found that the fan blade could move on its shaft (not rotate) but move along the length of shaft. After moving back and forth for a bit. It freed up and rotated.
So the question is this normal for the fan blade to move along its shaft?

If so how much movement are we talking about?

Stranger think is everyone talking about how noisy the fans are. But having to have the fans to print properly with PLA. Mine has always been quiet ( many the chamber fan has never worked) but has printed great with multiple types of PLA and Petg.