This is not the way you are supposed to create a multisig wallet.
You need to create two multisig wallets files, A and B, where A has the xpub of B, and B has the xpub of A
See the doc here:
https://electrum.orain.org/wiki/Multisig_WalletsBefore you do anything else, you need to recover the coins you sent to the 2 of 2 wallet you created.
For this, create a new wallet file, select 'restore' and 'multisig 2of2'
Then enter the two seeds in the dialog box. (the seed of the standard wallet, and the seed of the 2of2 wallet you just created)
please report back here.
it may be that the multisig wallet creation procedure is too difficult for most people.
in any case I think we will have to improve it.