I have 5 x HS100 devices for years. All work perfectly as I'm considering buying the Tapo plugs, I decided to download the Tapo application.
 

Installed perfectly, and added all the Hs100 plugs perfectly.

However, now when I switch on one plug or five plugs come on. When I switched one off, they all go off. This is either using the Kasa app 

I have reset all of the plugs, by pressing the reset button for 15 seconds and re-register them all. 

I still have the same problem. Now I've got five plugs that I cannot use individually as they all switch on and off together. I've checked and they are not in a group. Has anyone else come across this problem and a fix. 
 

It's really annoying that an application has corrupted these plugs which were working perfectly fine before loading the application