Having trouble With scale

Having trouble with Mach3 do not know if I did it or not I hope I did and it’s not the machine for whatever I did The Mach3 went to half size on the screen and it wouldn’t work so I deleted it and reloaded it didn’t work at first deleted reload it again did not check parallel port off now it’s working but I put a 1 inch circle DFX file converted it to G code But it cuts out a 4 inch circle on the material.
Will only jog approximately 36 inches a minute hoping someone can help.
I love this machine using sheet cam for G code