hi i designed a one sided pcd with a smd regulator on the back side after that i printed out the pcb and make the holes but when i wanted to put in the part the first three pins are in right place but the rest keep getting off until the last pin does not even touch the copper of the pad at first …

I don’t want to question your measuring skills too much, but the last pad is not off by 3mm. That type of connector usually has a spacing of 2.54mm (100mil). And you are not even close to being off by more than the spacing between the pads. I used to etch my own circuit boards and had this problem …