Contact's messages disappears from Messages view

Not sure if this is an iOS or MySudo web issue but I figured I'd post it here to see if anyone has any ideas.

I have a sudo (let's call it sudoOne) that I've used for a few months and today I logged on to MySudo Web to initiate a conversation with a contact of sudoOne that I had not previously messaged before.

The contact received my message and I was able to respond to them as well. However, when I go to sudoOne in the iOS app, I don't see the conversation with that contact in the Messages view.

If I search for the contact's name, I see the conversation and view it. Pressing the "<" icon on this screen takes me back Messages view of sudoOne and my conversation with the contact will then appear in the list. However, if I switch to another sudo and then switch back to sudoOne, that contact's conversation is again missing.

Anyone experience a similar issue?