There has to be some messed up algorithm with your programming or something. I keep getting like the same exact hands on different tables each deal, and this happens multiple times in a session.
This seems to happen a lot when multitabling on any poker site. It's just observational bias in my opinion.
But just a quick clarification. Are these same suits, same cards? And displayed in the same order? If this is happening with the windows or android clients and you see the same suits, same card values and same order across tables, then this might be something to notify the devs about in case there is a beta bug in displaying the hole cards across tables.
Also you should check your software to see if someone hasn't hacked into it and is able to see other players cards. It's happened for other poker sites, ones that deal with actual money instead of BTC.
The only way this would really be possible is through an virus or app on your machine that decodes your hole cards and sends them off to a third party.