Create Pull Request shows too many commits

[rsbeckerca]

I have a complex GitFlow structure, where I am using a Sprint branch for integration prior to merging into the main branch, while the Sprint is active. The workflow is:

1. At the start of a Sprint, we create a branch for it, let's say Sprint-33 from main HEAD.
2. When we create a topic branch from a Jira issue, it is based on the Sprint-33 HEAD. That part works file.
3. Commits happen and are pushed to the topic branch.
4. When delivering we create a Pull Request. First, the web page for the pull request shows a merge from topic to main, not Sprint-33, which would be preferable.
5. When I change the destination branch to Sprint-33, the commits being merged change, but still include previously merged commits that are already on Sprint-33 not topic. This is a bug that needs to be fixed because the pull request content is wrong. It should just contain commits from topic., not from Sprint-33 and not from main.
6. We use merge squash for merging from topic to Sprint-33 and regular merges from Sprint-33 to main. That part works fine.

This happens regardless of whether a previous pull request was declined or not.