Alignement of buffer wake panels and vortons for sail analysis

Hi there,
not sure if this is something expected or not but I believe there might be an odd symmetry in the buffer wake panel alignement and the true wind direction when doing an analysis on a sail. The wake panel and vortons seems to aligne themselves in a direction matching the symmetric of the wind direction (free stream velocity vector).
You can find a few screenshots showing top views with the wake panel buffer and the wind direction, but also the vortons. The panel wake is said to be aligned with the free stream velocity but that does not seem to be the case here. I believe vortons at the rear part of the wake should be convected in a direction aligned with the free stream velocity direction, which is not the case on the attached screenshot. In the available AC boat sail7 file, I can see the vorton being convected as expected, but the buffer wake panels seems again symmetric to the wind direction around the longitudinal x axis.
(here is a link to see the screenshots https://1drv.ms/f/c/f5481a46a90a15ef/EhcWFgMer51Hh9GjwTTcIgABnxFpKqyLf5a2ThXYQhUURg?e=c4v8X4)
Let me know if you need more information,
Nicolas