I was looking at different groups, and most of them I can't open to look at. I click on the group, and a totally new random group will appear.

I can't get the join bar to come up for the life of me even if I wanted to join. Since I am new to looking at groups, I'm not sure if the group section is glitched, or if I need to meet some criteria to join more groups. Has anyone else been having trouble in the Groups section?