Are both these well measurements prior to production? - If not, and if you have some pervasive perm heterogeneity (ie higher perm lower on structure) depletion could be affecting it.

Are they both from the same period? - If not, could offset production be depleting the field through a common aquifer? (I've seen this before)

Are those depths TVD? It's odd that they don't start, end, or at least extrapolate to a common pressure..... their pressures cross over mid column. If they are TVD, then either you've had some sort of differential depletion, you've got some error in your measurements, or they are different pools (or if connected, via a different density fluid)