When you start to have issues with Spot N Paste, or if its not pasting correctly, its always a good idea to reset the store data before trying other trouble shooting techniques.
Here is a video on how to do that.
If you want to completely remove a store or may have configured it mistakenly, you will have to do it from Spot n Center. Once the store has been synced with Spot n Center, whenever you try to reset, that specific store will be fetched and saved in your browser storage from Spot n Center. So it will be best to have it removed from Spot n Center as well.
Here’s how to save and store/supplier on Spot n Paste and Spot n Center: