RevitaLashCosmetics, RevitaLash Advanced Eyelash Conditioner

I had already been using Revitalash very successfully for a year or so and purchased one from the seller Abufazl at a reasonably competitive price. However after a few weeks of use my eyelashes began to get thinner and shorter - not only that but the slightly annoying side effects that I had always had- slight darkening of the skin close to my eyes disappeared. I noticed slight differences in the bottles. I’m afraid I am convinced the product from this seller is either fake or old and ineffective.. beware!

Is this product legit? More than half the price compared to the manufacturer’s website