Create different crop regions of views via View.SetCropBoxCurves (MEPover pack)

Hello. I’ve created dependent views with the same crop region. And now I’m trying to edit crop regions (create different crop regions for views).
I use MEPover pack.(@T_Pover) But something wrong and it doesn’t work right. Sometimes script creates lines (I can’t delete it, you can see on a screenshot).

Thank you in advance.