I have just reported this glitch to Facebook because the membership features on my Group Facebook page disappeared. On the main page, there are two main features regarding membership. The first one is on the left hand margin, wherein the requests of those who wish to join the group appear. This function disappeared. The second feature is on the top bar, which normally includes also the name members. Under this bar, there is information and a list of all members. This too disappeared.
I am writing to apologize to those who might have applied to join my group and have not yet received a reply.
I hope that Facebook will remedy this glitch.