timing analyzer relationship

Without knowing the properties of the clocks in question, it's hard to say, but the relationship column represents the time between the launch edge and the latch edge used for the analysis. The value gets doubled if, say, you add a multicycle setup of 2 since that extends out the timing analysis by a clock cycle in the destination clock domain.

Are these all the same clock domain? Are you using multicycle or other timing exceptions like set_max_delay?