Hello Michael,
thank you for your explanations.

When I deselect rigid, the issue still persists : (
and I have used the rebuild command and followed the same process,
but I am still getting the same result.

Have a look at these tutorials; why can't it be as easy as how Chipp does it : )
https://www.youtube.com/watch?v=QwCXd1zMnSQ&t=123s
https://www.youtube.com/watch?v=Q5-tLNpnhpw&t=11s

Cheers.
Sandeep.