Konad special polish

Hello!

I wanted to use a pink special polish by Konad for the pattern "inspired by phone case", which I didn't use the last 10 months. And it appeared to me being much lighter than I remember this polish. It was too sheer for stamping over any base but white, that's why I didn't use it for a long time. As I opened the bottle, I was surprised:

If you look at the screw thread: there is some dried polish of much more intense colour! I didn't know it can happen to a polish...
How are your experiences with it?