When this happens, it means the software is configured to use multiple logos from that were added to the database. The best way to fix this is to access the database/section where you can add/remove/modify logos. Access the section then remove all the logos you have and leave just the one you need. Restart the application and then generate a new invoice. Additionally, if you have the possibility, access the template section and modify it to use only the logo you need or specify.