my snapchat says i have a snapchat in my lock screen but nothing’s there when i unlock my phone

So basically when i go to bed and then wake up i get all my notifications from overnight and i see the notifications from the 2 people that i want to talk to most and i know that we both have each other added and i see notifications from them both in my lock screen but then i open my snapchat and i have every other snapchat that it said i got except the two people. it’s like the people that i talk to the most on snap, this happens and it says the snap i delivered the night before still sent but i actually got a snap from them. idk it’s super confusing but it’s annoying and i want it to stop doing that