Note Air V3.1 Non pure white or black note templates bad responsive

Hi, i'm tryng to create some templates but i notice that if i use a non pure black or pure white background i need a full refresh after every action to se the changes. Like this is impossible for me to use it. For example if i use the ereaser nothing change visually but i nedd to refresh an then i see the changes.

Am i do somthing wrong or simply the device cannot handle non pure black and white templates? The same obviously happen if i use a picture from web or phone... Very bad.

Thanks