Guys,
I absolutely forgot to tell that:
on Electrum (Tails) > Addresses > "lost" address 1LP6LQ726YJR9wkPLnHWJEfH335DDuiNtL > label - I put: "used " once I transfered the money from Electrum (Windows) to that address. I always do that, so that I use the address only for one time transfer.
Maybes that's the reason why it doesn't show now in the recovered wallet?!
Before all that, when I created Electrum on Tails I made a shot of all my addresses, here it is:
https://anonfile.com/097eY563n6/20190923_183206_jpgThere you see that damn address as second from the top
All the other questions I will answer in short!