As I was going through Vault 11, I entered the sacrificial chamber, killed the robots that are ment to destroy me, accessed the vault mainframe and gathered the info off that.
Then I went to return to the Lucky 38 and all robots in the lucky 38 are now hostile to me and I can not complete "The house always wins I" it's no longer highlighted in the quest menu and the section on recovering the platinum chip is not marked off.
I re-loaded a save just before entering the chamber in Vault 11 and I still have the chance to complete "The house always wins I".
Has anyone else experienced this?
I'm assuming I'll just have to come back to Vault 11 and finish that off after I have completed "The house always wins I".
Anyone got anything to say about it?

Vault 11 shouldn't have anything to do with it; perhaps you should just re-load the save and experience the awesomeness of Vault 11 later if you really think that's the problem.

The "robot hostile" thing is probably a reputation glitch or something. There are plenty of those in New Vegas.