Although the server is facing lag as of lately, the video provided by
@Obsidian does indeed show you skipping the sniper animation. Unless you can provide evidence that you didn't skip the animation, its only your word against a video - the video will always come out on top in this case scenario. Furthermore to add, looking at your infraction history you've previously been punished for bug abusing (c-bug, sniper anim skip, animation abuse) can all fall under this 'infraction'.
Your appeal has been denied, the infraction will stay.