I may be way wrong here, but I believe eyelashing is a tension problem, for the most part. If the eyelashing is on the backside, you will need to tighten the top tension (mine usually 8-9). As for what you have already done, yes, it needs to be "undone". Where you see the eyelashing, the thread is just laying on top of the fabric and probably not just on the curves....so it is pretty easy to rip out. If you don't fix it now, I am afraid you will be unhappy later.