Auto-seal flag did not working

I post a deal to the specified miner, but the node is crashed for some reason while it’s sealing.
when i restart the node, it did not continue to sealing the data, and i query by the $DEAL_ID

go-filecoin client query-storage-deal $DEAL_ID

the status of deal is always ‘staged’, the CPU usage is less than 1% but usually it should be close to 400%. I found the following output in the log.

auto-seal has been triggered node.go:880

But obviously it not working.

Note: I did not run go-filecoin daemon with --auto-seal-interval-seconds flag. so it should be the default value : 120s.