Solved! Switching messages apps...keep getting old notifications

Oct 5, 2018
I just switched from what I guess is Andriod Messages app to the Verizon Messages + app....and it keeps giving me notification about messages from months ago! And I feel it's not going to stop! How to I turn this off, if possible? Thanks!
I am using a Samsung Galaxy S7 Edge. I switched apps because someone told me the Verizon Messages app would tell you when some had read your text and when they were replying.