Hello, Lee.
We're using Revit 17 at our office and we haven't found these issues.
Maybe your graphic card is providing these visual problems into your model.
I recommend you to check your Tag family. Check if the parameter defined into the Label it's the correct one.
Any doubt, I'm available.
If your problem has been solved, please click on Accept as Solution. Then others users can take benefit of it.
Regards,
Felipe Góes
Autodesk Instructor