I am not too surprised that you can get this type of result occasionally (or as you put it several times) on a ding. With a strong tailwind sending a drive 300+ yards you can get significant side to side variation helped by wind speed, distance travelled, club precision and a particular hole's sensitivity to side wind.
Note that the wind's directional arrow "twitches" from side to side, indicating directional variation. So your "wind at my back straight wind" is not necessarily the case. And your driver's precision is pretty good but will also have significant variation on long drives with strong winds (I've read somewhere that it could be 10-20 ft or more in any direction in this situation).
That said, given identical wind speed/direction e.g. in your case 13-15 mph tailwind, you can expect variation distributed evenly on EITHER side of your aiming point.
A fair test of this would be to perform at least 10 or 20 dings using Mulligans in practice mode to maintain the exact same tailwind.
Again, a twitching wind indicator showing the same wind speed range and direction is not necessarily the same wind condition when returning to the same hole to execute the same shot.
-Keith
EDIT: for the Mulligan test you might experience an unseen wind direction biased right or left relative to you aiming point. So an even distribution would also be biased in that same direction e.g. for a wind pointing slightly left you might experience shots on this hole ranging from out of bounds to maybe landing near the flag, depending on the bias.