Huawei P20 missing notifications from some apps completely

[Android Central Question]

i just upgraded to the P20. everything seems set up fine. i dont have the pro so i dont think i can set he always on display (or when i follow the instructions it gets to a point where what they say i dont have lol) but i dont mind that too much. the problem i am having is that i am missing notifications completely from some apps, for example sell on etsy which i have a store on, i used to always get notifications when a purchase was made or a message sent to me and im not getting them. all the settings are saying to get notifications but they just arent showing up. luckily i just happened to look in the app today and found the order.