Vertex Group buggy? (Perhaps I'm just too stupid lol)

Hey guys,

I wanted to assign two different groups to two different circles.
But everytime I select the second group, it selects also the Vertexes between the first & the second group…
( (The group “first” is the circle right under the selected))
and after I made a new group and assigned it (When I click on “selected” @ the first group) it looks like this:

And of course I deselected everything before clicking on “select”

Or is there an easier way to select a circle of edges inside of a cylinder :?

best regards deSpeachPeach :slight_smile: