Did we ever find a resolution for this? I'm encountering the same problem.
In addition, when I open text conversations it opens to random dates months and months back. Texts sent last summer, even. I have to close the app and reopen to get my current messages.
I just had the same problem with my S7 after the Oreo update. Turns out, the "Messages" app that I assume came with that update was also playing a notification tone with every text message. I turned that off in the settings of that app and the double notification stopped. So basically, it was two different apps notifying me of a new text message.
HTH,
Dave
I know this is an old thread, but I just started having the double notifications problem for texts in Message+ on my Galaxy S9. I tried a few things from this thread, to no avail. I noticed the one thing that changed for me since the problem appeared was that I would get "Permission Monitor" notifications constantly, perhaps beginning with the most recent OS update.
I simply opened up the settings for the Permission Monitor, and unchecked Messages+. The problem was immediately solved.
I just got this via email for Messenger getting double notifications in one message I tried to open it and it won't let me download it at all
https://client.vzmlab.com/vzmand/instabug/VZMessages-7.3.8-51-user-release-signed.apk you qaq2
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