If I remember correctly it has something to do with the MAC address VSpehere is assigning the new interface (at random). As most unix/linux sort their interfaces with some kind of "lowest mac address first", there could be the problem in your case. If the random assigned MAC is lower than one of the other 3, it gets mangled.
(I stand corrected if that's not the case here, but we had a somewhat similar incident with normal BSD and Linux hosts and vSpheres random MAC assignments)
Greets