Alternate Realities, Karma and Reincarnation - KR theory

I was watching the movie 'The Triangle' last weekend. The movie talks about alternate realities, i.e. alternate dimensions and how the same person can exist in 2 different realities.

This is why I find it tough to accept the alternative realities theory.

Ever wondered why some people are rich and some poor!
Ever wondered why some people have abundant of food to eat and some are starving!
Ever wondered why some people are happy and some not!

Well...if you consider the life of a person as a linear event, as many religions do, from the birth of a person till the death of that person, you will never be able to understand why each and every person is different in almost all ways from others. It just doesn't make any sense.

But, if you apply reincarnation and Karma, the life of a person, becomes cyclic. The life of a person, becomes the life of a consciousness. The consciousness takes a new body after the old one dies. And the quality of the new life depends on past life karma. If you do good things you will get better things. If you do bad things you will get bad things. This Karma and reincarnation, lets assume its just a theory and not something which has been observed, makes lot of sense and almost immediately answers most of the questions like why one person is rich and the other poor etc.

But the Karma and Reincarnation theory, let's call it as KR theory, directly contradicts with the alternative realities theory. I do not see how both can be true.