The messages that functions normally like you would expect it to but any time I get a text message from my wife who has a Galaxy S9, I get the text message twice. This issue can only be reproduced by receiving a text message from My Wife and nobody else.
I have been searching for a solution to this problem and I have already wiped the apps data and cache multiple times but nothing has fixed the problem.
Has anybody who has installed the S9 messages app from apkmirror.com run into the same problem and if so, how have you fixed it?
Update! I have officially figured out what is causing the duplicate text messages after updating to the latest messages app.
In the newest releases, like the ones that came on the S9 and S9+, samsung integrated the message service app into the messages app. This, for some, is causing duplicate text messages when receiving messages from people who are on the same service provider who's devices also have advanced messaging with chat features.
To fix the problem of duplicate texts, you will need to purchase and install package disabler pro ($2.50 - don't be cheap...) from the play store and disable message service app and reboot.
That's all there is to it enjoy no longer getting duplicate text messages just as I am.