I’ve narrowed down the issue with a second zeRGBa on a page defaulting to the middle (when the program loses focus/Android phone put on standby) down to the local server. I’ve switched back to your Blynk server and the problem went away. I made no other changes. The local Blynk server is the problem (latest version no more than 2 days ago).
This problem with the second zeRGBa occurred reliably, every time with the local server and has gone away using your server.
(the problem with the segmented switch not working was my fault. Still cant copy/paste that correctly but I think that might be Node Red?)