Hey @MDPWSB
Since you're not able to share code it makes it a little tricky, there is a possibility that the symbology and title may attempting to update, but is updating it to something that could be missed and it is completing "normally". Are there any try except catches in your code that could be passing that portion?
Edit:
If this is in a Notebook, I would try to separate the for loop with static data, and test a single run to ensure that it is doing what it should do. If it is not in a Notebook, you may try using another Python document to attempt and use static data to run this only once with the same data, and have it end with the title change, just to be sure it's not skipping.
Cody