i dont understand judgements new tooltip

watching someone on the pbe

rank 5 judgement:

garen rapidly spins his sword around his body for 3 seconds, dealing 1092 physical damage to nearby enemies -- 30 plus 38% of his attack damage (106), 10 times [...]

is that a miscalculation in the tooltip?

because 10 spin ticks for 30 + 106 damage should amount to = 300 + 1060 = 1360 total damage. not 1092 in total

it looks like it doesnt properly calculate the base damage for each tick, and only once with some rounding. 30 + 10 x 106 = 1090 instead of (30 + 106) x 10

edit.: ill just call this a bug report.