So today I was shooting my daystate huntsman regal with a 3-12 MTC mamba lite in sportsmatch mounts. At thirty yards the parallax wheel read 25 yards in focus, and at 50 yards it read 35 yards in focus. Anyone else have this situation. Is the scope defective, are my ageing eyes the problem or is this a byproduct of the price point? It was set at 12 power.