Trim paths make round cap line protrude a long distance

[Stefan Cargoski]

Hi community.

Is there a way to fix in the trim paths and round cap section, the line animations from protruding so much into the first frame. On frame zero, the line is set to zero, but on frame 1, the rounded cap reveals too much of the rounded cap, like 2 notches, then the animation is smoother 1 pixel each interval, and the line finishes again abruptly with 2-3 more notches. 

[Kyle Hamrick]

You're getting this abrupt change because of your Stroke Width. You might try animating that up from a lower value over the first few frames of your Trim Path animation to smooth this out.