Notification flashing a yellow light on screen

[Cassiomori]

Hi guys,

I recently bought a Galaxy S9+ and installed Glimpse Notification to get my screen wake up with notifications. However, now when the screen is on and I get some notifications like on whatsapp, the screen flashes yellow.

I tried to change a lot of the notifications settings and it is still happening. Even when I turn the Glimpse Notification off.

Does anyone know what is going on and how to fix it? My android version is 8.0.0, Samsung Experience versions 9.0 and Kernel version 4.9.65

Thanks!