Certainly an odd piece. I've never seen a jian like it.
It's certainly not unheard of for Asian arms/armor to be made with a European inspiration, most notably Japanese Kabuto(helmet) made using a Spanish combed morion as the base.
I don't have any training in Chinese swordsmanship, though I suppose this could be an attempt at improving point control on the jian, being a cut-and-thrust sword.
I also don't see anything wrong with it. The reversed quillons are nothing to be suspicious of. They are still an effective guard, but not able to catch a blade like forward-facing quillons would be.
In fact, I'd venture to say that an upward curvature is just as common in traditional jian guards as a downward curve. Usually though, these guards are bulkier and wider as oppose to the thinner, more European-inspired quillons seen here.