Is that address yours or does it belong to the channel? The address that funded it was multisig (unless I got script hash the wrong way round).

I'm not sure what shutdown actually means but it probably means it's in the process of ending the channel. It might either have to wait for a htlc to stop being enforceable or to wait for the other party to cooperate in channel closure (if the other party don't participate, you might be waiting 2 days to 2 weeks for the funds to come back, but within that time they're pretty safe afaict).