Create slices moves audio out of place

I recorded a bass part in my project which is set to 75bpm. Then I wanted to slice the bass notes and quantize but when I click “create slices” it moves the notes to different places and there are big gaps in the notes. Furthermore, when I look in the pool, the bass part has a different project tempo associated with it. If I change this tempo manually to 75bpm , I am able to slice the audio without the individual slices moving but that is an extra task.

  1. Why are the bass parts not 75pm in the pool just like the project?
  2. How can I create slices without having to manually change the bpm in the pool?

I noticed many people have had problems with this since cubase 6 so I hope I can understand what I am doing wrong.
thank you for your help!