I have seen similar problems reposted but cannot find the solution to my problem.
I have child posts of a parent set up but when I change some data in the parent post, the permalink of all the child posts get changed to the parent permalink.
Eg
parent post (place-name)
child posts (event)
child posts (club)
child posts (business)
So events, clubs and businesses are all children of a place.
If I change a custom field in the place post, all of the child posts have their permalinks changed to the parent permalink.
This may be nothing to do with Types and could be something not working in custom permalinks but I cannot work out where the problem is or how to work around it so any help much appreciated.
(I just did one additional test – I don't need to change any fields in the parent – just saving the post resets the permalinks on the child posts)