Problem with Polygon Lasso Tool

[loveenasirohi]

Each time I use polygon lasso tool - make a selection to cut the selected space - instead of cutting it out it instead leaves me with a white colour background on the selected area. What do I do? 

The selection leaves a white shape instead of the layer below it. I want the pink circle with the green background after cutting out the head. PLEASE HELP!!

I selected the desired area I wish to seperate and cut outThe selection leaves a white shape instead of the layer below it. I want the pink circle with the green background.

[Bob_Hallam]

Reset the tool preferences 

[PECourtejoie]

Hello, how are you cutting/deleting?