This sort of thing happens all the time, and it's usually subject to some level of debate. Just look at the ponderosa pine (pinus ponderosa. Some say there is one species with multiple subspecies, some say they are just different varieties, some say that they are different species, or some are and some arent, etc.
The only reason Pluto is no longer a planet is because we discovered there were loads more planets and couldn't be bothered to acknowledge their existence!
i've spent 25 years on this blue marble fascinated by space, and only recently discovered there multiple long orbit dwarf planets going around the sun??? that is so cool why is this not widely known!
we used to have a handful of elements, but when we kept discovering more, we didn't change the rules to have elements, and "strange elements" so schools only have to teach about 16 elements.