I have a BSA Sweet 17 scope and need help sighting it in. I saved a picture with different colors to try and help explain what I am talking about and maybe someone can help me. The very front of the scople ( circled in RED ) has numbers listed from 7.5 yards to 100 yards. The top of the scope ( circled in BLUE ) is the height adjustment. The side ( circled in YELLOW ) is right to left adjustment. And near the eyesight ( circled in BROWN ) is the zoom level.

When I sighted it in I had the frond of the scope ( circled in RED) on 25 yards and the eyesight ( circled in BROWN ) on 9 zoomed all the way in. I was about 40 yards away and could hit a 2 X 2 inch square each time I shot. I thought it was sighted in.

The other day I was squirell hunting and had to adjust the front ( circled in RED ) to 10 yards in order to see up close. I had the crosshares right on the squirell and missed. I shot at a target today and my scope was off with this adjustment.

Can someone has this scope or knows about this scope can you please explain the best way to sight this thing in because I don't know what I am doing wrong.