After some break, now I am back to art. I am using latest Art Studio Pro 2.3.6 and iOS 13.1.3. Whenever I edit some brush settings in a brush, then use some other brush and after some time I try to use the edited brush it reverts back to default settings. I’ve uninstalled and reinstalled the app but the issue continues. Please guide me what steps I am missing here.

It seems that by default the per brush pressure curve setting doesn't reflect the global pressure curve setting in the latest 2.2 (319) beta. Please check.