My photoperiod Strawberry Cadillac at 7 weeks has ...

Not polyploid, just a genetic mutation/variation. Yes it is quite common, I have had plants with random nodes that sprouted 3-4-5 leaves........it does not affect anything, you still get normal buds, not multiple Frankenstein buds appearing. One plant had just one branch on the entire plant that had 3-4 leaves at evey node and every other branch had the normal 2 leaves at every node. Cannabis is a surprising plant at times and the longer you grow, the more weird things that you will see! Triploid would mean the entire plant has 3 sprouts at every node, not just a random triple leaf sprout here and there..........it is just a slight genetic "hiccup". True polyploidism in cannabis is extremely rare, there have only been a couple of scientifically varified cases over the last century. Cannabis does not have polyploidism in its' ancestry.

50% to over 70% of all flowering plant species have a polyploid ancestry; having it express is another thing. One study estimates polyploidy forms at a frequency of 1 in every 100,000 plants. Quite rare. RNG :)

It happens from time to time and it is a genetic thing. It is called a poliploid (in this case triploid) growth-pattern.