Sonoff 4 cannel pro gap time

i setup up my 4 channel pro with Ewelink component.
it’s working well, but when for example i tern all the relay at ones
it open the first one gap of one second, then the second one then another 1 second gap,
then the third one …
also when i tern off all the switches there’s a gap of one second between
is there a way to cancel this feather

Thanks
Refael