Issues manually logging lean muscle data

I see this is a new feature (or atleast I haven’t seen it before), so I’ve been trying to log previous data to get it up to data however it won’t let me. I’ll go through the adding process it’s let me save it but doesn’t save. I’ve try multiple time, reset the app, nothing seems to be working. I’m not sure if this is just a bug or there’s something I can do.