Hello Ezat,
I was in vacation so I could not respond to your message. Anyway now your pipeline looks correct so I guess these bumps are coming from your data.
If you’re absolutely sure your data is correct and this is a bug then please open an issue on the ParaView Gitlab with clear steps to reproduce and associated data (https://gitlab.kitware.com/paraview/paraview/-/issues).
Also please read this post : How are features and bug fixes incorporated into ParaView?. If you want to be prioritized you can ask for support on Kitware websites (https://www.kitware.eu or https://www.kitware.com).