I have 2 female syrian hamsters and they live togeter sleep together everything I thought they were supposed to fight why is this ?

Sometimes you get lucky.

Just because they're not fighting now, doesn't mean they won't.

Syrians are solitary animals. They really don't enjoy being with others of their kind. There are people that put Syrians together and never have an issue. It's luck, that's all.

There are people that put Syrians together, never have an issue, until one day, they look in on their hamsters and find one dead, the other injured, because they fought.

It also depends on age. If they're young hamsters then they will live together and be okay, until they hit sexual maturity.

If they've been together for over 6 months or more and never fought, you make continue to be lucky, or you may one day find both hamster badly injured or dead because they fought. It's a gamble. A high risk gamble. Some people win, most don't.

It's all luck, not logic. You're putting two animals in a position they're not comfortable being in. Your luck may continue, or it could run out. Sadly, you won't know until something happens, at which point it will be too late.

Good luck.