Plastic Stencil Cut

[Plastic Stencil Cut]

Hi can some please tell me how or what setting i should use to cut - Plastic stencil - thanks

[sc cutter]

i been using my cutter at the same setting and cut the same item before but now for some reason it is cutting too deep  - but i was watching it cut it seems to be cuting the same area over and over - it keeps coming back the the same area to cut again - why is it doing this?