First of all, you don't have a plot there! You can't hit squat unless you have a plotted track to confirm newly acquired data against. I don't see marks for two position points three minutes apart, so I don't understand how you measured speed. A plot is how you find error and refine data. No plot equals no booms!
Interestingly, it looks like your impact point is set up ahead of the target. If your speed is nearly correct and you're set up for a solution that is too far away, the effect is the same as underestimating speed. But since you are led too far ahead of the target, a shot might well hit here! You are certainly close enough to absorb medium sized error without causing a miss.
So, what you have here is an interesting situation without enough information to analyse. In this case i cannot tell you what the he$$ happened.
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