Does uninstalling/reinstalling the Garmin Connect app make any difference? You might try clearing cache for the app through your phone settings as well.
To delete a golf course on the Garmin Connect app:
Go to downloaded golf courses list and find course you want to delete. Long press on the course to be deleted and follow instructions that pop up.
That doesn’t work for me
To delete a golf course on the Garmin Connect app:
This does not work for me. Deleted all courses from Garmin Connect - but three courses remain as downloaded after that. I am unable to download my home course as it appears under an old name.
Does uninstalling/reinstalling the Garmin Connect app make any difference? You might try clearing cache for the app through your phone settings as well.
After you delete the courses by swiping left on your iPhone, try syncing your iPhone with your watch.