Uninstalling ModeMagic does not remove the labels that you had applied on your product images.
To remove the labels,
1. You can re-install the app from here - Install ModeMagic.
2. Once installed, launch the app - Launch ModeMagic. and click on the 'Undo Badges' tab on the center of the screen
3. Select the sticker you want to remove from the list of stickers in the left panel.
3. Click on "Yes" button from the dialog box in the screen that shows up
If this does not work for you, check if you have modified the sticker-ed image by any chance.
If you still run into any issues, ping the ModeMagic team from the in-app chat or drop us an email at [email protected].