Commit and Push successful and then shortly after it says I am 61 behind

Mych

Hi,

I've been using Sourcetree quite happily for a while now. No issues. Suddenly I have a project that I had a feature branch. Committed ok. Finished feature, merge to develop branch ok. Push to origin Ok. Within a few mins I get a badge with up arrow showing 61. I did another push to origin and all OK. Again within a few mins (no changes to the project) and it shows the badge with 61. I do another push to origin and check show output. This shows (as far as I can tell) that both sides are identical... Everything is up to date. 

git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks push -v origin develop:develop
Pushing to https://xxxxxx@bitbucket.org/yyyyyy/zzzzzz.git
To https://bitbucket.org/yyyyyy/zzzzzz.git
= [up to date] develop -> develop
updating local tracking ref 'refs/remotes/origin/develop'
Everything up-to-date

Completed successfully.

And yet again after a few moment I get the badge again. What is happening? I'm using version 3.2.6 on Windows 10.

Mych

It seems that the remote repository had two branches (Develop and develop). Develop was the original created back in 2018, while develop was created when git-flow was introduced (or at least when I started using it). It seems both were being tracked to the local develop branch and hence the Develop was way behind. I have deleted the Develop branch via the BitBucket web site and hoped that would solve the issue but it has not. Sourcetree still thinks there is a Develop branch on the remote. See attached screenshot. 

What do I need to do?