Using multiple wallets in Sphere

[greasyy]

I have made two wallets with a positive balance in both wallets. But after importing the second wallet, I was unable to spend my funds from the first wallet and it showed me the error
"2021-01-12 09:07:19 opid-98bfac1b-2fc7-48cb-bb35-192a8dcdfd94: z_sendmany finished (status=failed, error=Could not find any non-coinbase UTXOs to spend.)"

Also when entering "zen-cli listaddressgroupings" in the terminal it only showed the addresses of the second wallet, I guess that was the mistake. I could not solve the problem and withdrawing funds from the first wallet until I exported the seed phrase to another wallet. (Although I didn't try very long either, because I wanted to spend those funds.)