Lately, when someone sends me an MMS with a picture, Join in Chrome is showing the wrong picture. In fact, it's showing very old pictures. Is there some sort of naming collision, maybe? If it matters, I recently moved to a new phone.
Yes, that's very possible when moving to a new phone. Could you please try disabling and re-enabling the SMS service option on the new phone in the Join Android app and see if that fixes it?