I don't know if this is an issue with Coop or Chachi or whatever other client people are using but sometimes I send a message on Chachi and then open the same chat on Coop and I don't see my message (other times it works).

There was also the case of someone messaging me and I don't see the messages on Coop but saw them on Chachi -- but, again, only some messages. Most show on Coop, but not all.

Messages I send on Coop seem to always show up on Chachi.

Again, I don't know if this is a bug on Coop, but still I want to ask you and @verbiricha and @staab to use each others' software because that way it becomes easier to narrow down what is happening than to an outsider like me.