I haven't plated that yeast strain before but you have me very curious. I will buy some yeast and brew with it next weekend and streak a plate and see what happens. In the meantime I bet you'll have determined what is going on if anything. Keep us posted and I'll do the same if I'm able to brew next week.
runhard, trainhard, raceEZ
keg 1-Graham Sander's Tropical Flower Wit
keg 2-Yooper's Fat Sam - I highly recommend it
keg 3-Yooper's Fat Tire
keg 4-XXX Stout
Fermenter #1-Graham Sander's Tropical Flower Wit