Illaoi doesn't seem to stack conqueror when her tentacles hit the same target multiple times?

You can test this in training mode, but if you use Illaoi E and then W the spirit(or the champion) and the tentacle slams twice in a row, the tentacle slams will only stack conqueror once. Shouldn't it stack twice as if her tentacle hit them twice(giving her 4 stacks)? This is mostly noticeable when you E a champion and then ult and W a target to get another slam. You'd expect to get 4 stacks from just the tentacles slamming right off the bat but you'll only gain 2 stacks.
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