i got my hands on a couple of cords of red oak.... been left in round for 2 yrs. now it was stacked on the ground 3 rounds high 3 rounds wide by at least 20 ft... covered with plywood and tarp on plywood... it seems like the outer ring that oak has is rotted out on just about every piece i split , i can understand the ones on the ground but the next 2 up? is this common for those of you who leave wood in the round for awhile?