thats weird indeed
something is wrong with your electrum wallet for sure.
can you share an address with a balance?
if you right click on your wallet (electrum one) and select open with "Notepad" do you see that address there

also from where do you have wallet.dat? i have read the full topic but didnt understood what that file has to do with your electrum wallet file which doesnt contain the extension .dat
did you name your wallet "wallet.dat" when you have created it in electrum?