I only see two beams, not four. Regardless, it would appear to be an improper loading condition on the bearing plate of the post. With two beams acting independently, i.e., not bolted together, the loads being applied to the bearing plate are eccentric, i.e., applied beyond the support point of the plate. With the plate essentially cantilevered out from the post it may be overstressed in bending. (Judging by the size of the wood beams and the fact that two or four were required the loads are probably quite high.

It there are four beams then the concern would be even greater with the loads from the outer two beams being even more eccentric.

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