In Safari App takes time from clock

I am quitting playing this site, as I use safari and the clock is somehow manipulatable by opponents. Two rated games I am watching opponent time drop and suddenly I have lost 2-3 minutes when move never appeared. Both times I was in a winning position. I am quitting playing until this works properly.

Hello,

I'm pretty sure that's nothing to do with Safari but rather with your connection.

Yes, i play in Safari and everything is perfect if my internet is good.