Open The sender of group SMS messages is not properly displayed

How I've noticed this: When an SMS message comes in for a group chat, I click to open the thread in the Join Chrome extension. At the top of the "chat bubble" for a message, it is supposed to display the sender's name. On the new message, however, it displays multiple contact names, making it very difficult to tell who sent the message.
Closing the Join window and reopening it to the thread displays the Sender name correctly.
Somewhat related side note: The icon for group message notifications displays the contact picture of only a single sender. Of course, this isn't terrible or app-breaking, but I think that displaying something else for groups would make more sense. The list of SMS threads shows group-threads as a little icon of a person, maybe this would work better for that.

 

I'm getting these same issues.