Bulbs offline

Hi everyone,

I’m facing a little problem regarding my 2 smart bulbs.

These 2 bulbs were imported by smartlife and works well.
I created e light group and I can turn on and off without problem.
But if they are on and i turn off my switch and then i turn it on again group lights is on but single bulb results offline, but it is online in smartlife.
With this problem i cant use the color change inside smarthings but I must go insede smartlife.

Am i doing something wrong?