I also think that this is working as expected.
In the first group, "counter" is set to 1 - this allows (via relevance) the second group and its questions to be shown. BUT, in the second group you have an equation question that immediately sets "counter" to 2, hiding both itself and the first question in that group.
In fact, if you look carefully, you can see a brief flash of those questions before they are hidden.
larissabruebach said: In this case shouldn't it work when I set the relevance equation to counter == 1 and then set the counter within the group to 1? As far as I can see it doesn't.
This also
does work as far as I can see. If I change the equation question in the second group to "counter = 1", both questions are shown in that group.