having trouble doing multiple cuts on gimp

[gloege]

i am using gimp and every stupid time i need to cut a new part on the picture it does not cut(when i select the new cut area the rest of the image is gone and only the cut part stays). also when i deselect the cutting tool what i cut out comes back. only thing i can think of out of this simple so simple it pisses me off solution is to save the pic each time i need a new cut


if you need i can upload the project i am working on