Confused

I have used this app for quite some time and I like to use it in my free time. I have always liked the app until recently. Lately the coloring has been off. I am not sure f it has been like this for anyone else, but the black lines turn pink on my app and 3D drawing turn completely black when I am done coloring them. Not sure why this Is happening.

Mariah_1oooooo about Recolor - Coloring Book, v4.2.4