Can you post the SVG here? We could look at it and see if the wandering lines are in the SVG or have something to do with your machine. If you still have it, post the VCarve file as well.
I assume you loaded the SVG into VCarve, then created an outside profile path (with a .25 or .125 square end mill) to cut them out, and a V-carve path for the triangle sections? Assuming that is correct, did you cut the v-carve first, or the profile (cut-out) first? Did you create holding tabs in the profile path, and if so, what were your settings?) I ask because if you profiled first, and the tabs were insufficient, you could have the ornament wiggling a little during the v-carve tool path, causing the wandering lines… if you v-carved first, then it’s a moot point…
One point that I noticed today that I didn’t notice previously, is that the circle cut outs are pretty good… it seems less likely to me now that your machine has a configuration problem (loose pulley set screw or belts).
The V-bit that you used was a 60-degree, right?