Hi @opticshrew2 ,
How you specified proper Table records within the Items property o the ComboBox control?
Based on the issue that you mentioned, I have made a test, and don't have the issue that you mentioned. The screenshot as below:

Please consider take a try to re-create a new app, and try the ComboBox control again, check if the issue is solved.
Also please consider take a try to turn off the "Improved app rendering (final validation)" option within Advanced settings of App settings of your app, then re-load your app, check if the issue is solved.
If the issue still exists, please consider submit an assisted support ticket through the following link:
https://powerapps.microsoft.com/en-us/support/pro
Best regards,