Welcome to the forums!
I am not sure what may be causing your problem but I was wondering if you are still using the default setup for hole callouts (yes, they can be changed to match what you want it to appear as). If so, then you can alter the .txt file that SW utilizes to suit your needs. As with anything you customize from the out of the box setup, create a backup first.
The default .txt file is located at C:\Program Files\SolidWorks Corp\SolidWorks\lang\english and is called "calloutformat.txt". Also, if you are having trouble search for "customize hole callout" on the forums as there are many forum posts addressing this topic and how to alter the file to suit your needs.