If X-Men First Class (XFC) is based before X-Men Origins (XMO) then how did Emma Frost end up being captured by Colonel Stryker?
The last we see of Emma Frost in XFC she is with Magneto and Raven, but it doesn't make sense that Magneto would let her be captured and not do anything about it especially when she is captured by someone who treats mutants so badly.
Also we see that Professor Xavier is walking at the end of XMO which would mean that XMO is before XFC. At the end of XMO he invites the captured mutants to join his school but in XFC he didn't create the school until he was in a wheelchair.
Are the films meant to be in chronological order or should they just be seen as two completely separate movies?