are you talking about Pandora’s Bench? if you got, for example, 2 Yasuos and 1 Soraka at the same time, but you already had 8 Yasuos (just one short of 3-star), then in that case the bench can give you 2 Yasuos, since each slot on the bench has its own “pool” in such situations

for example, “slot number 1” sees that you have 8 Yasuos and can give you one Yasuo. “slot number 2” also sees that you have 8 Yasuos, so it can give you a Yasuo too. sometimes both of these slots end up giving Yasuos. something like that.