Do you have the option in Settings->Account to Restore Messages from online? If so, you might do that to see if any of those not showing up now show up. I did that on my Droid Turbo 2 and some not received showed up. This could be related to the several other threads reporting sync'ing issues with the Message+ app.
I have the same problem. But can’t find “account” under settings. (Running message+ app on iPad.)
Start a new topic or ask questions in the open forum.
