Every other impression?

[LeoXIV]

hhm, does anybody know what happens or why when an ad is shown not for all the impressions but for every other one?

first search > not shown
second search > shown
third search > not shown
fourth search > shown

you get the idea :-)

PS: budget is on deplete. and there are 2 other ads that are showing up for all the impressions. (yes jealous)