Yep it should be, but I'm not sure the LN works like that
Like if the commitment tx is broadcasted then it may triggers something for the nodes, which seem to think that the channel is not functioning anymore. 

 Yeah probably. Or even just your node marking it as closed, without watchin the chain. Since you initiated the close.
 You could try to rebradcast with higher fee, or cpfp.

Or wait for low fees