The problem you are having happens to me every once and a while. Without knowing all of your settings. I can give you a few ideas.
First the part you you are showing looks pretty small. So depending on your cut speed there is alot of fast motion going on. Plasmacam seems to have an issue changing direction quickly. There are settings like corner acceleration to help with that issue. Slowing your cut speed will help.
Second and most important, your pierce location sucks. I have attached a file that shows a few pierce location ideas to keep your problem from happening at all. The one in the middle would be the preferred pierce location to get a arrow that you can hold (like the one in your pic). The one on the right would be if you wanted to cut an arrow into a sheet. Finally the one on the left would be an example of a pierce point on a part that has no sharp corners. I added a small triangle to the top to give it a place for a pierce point. After it was cut i would simply sand off the the added material.
C, I have tried the spiral lead in. I have not gotten good results whenever I try it. The start stop point always looks crappy. Besides it's a pain to draw it every time I want to try it.
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