Fighters fighting at at least two weight classes is very common. If it happens on the Men's divisions it certainly happens in the women's divisions too. But maybe you could enlighten us with the additional names beyond the four names provided that fought at weight classes below 135 pounds.
In addition I have already shown that a fighters fights in other weight classes doesn't mean crap. Otherwise Rumble has discredited every fighter he fought in several weight classes. And since Hendo lost fights at Middle Weight I suppose this means his victories at Light Heavy Weight put blemishes on his opponents records too. Poor Fedor and Shogun got beat by a Middle Weight. The whole argument is nonsense.
Again, you are missing the point, it is that girls have gone up to fight Cyborg just for one-off fights, without staying at 145 because they weren't 145 pounders. Cyborg has spent her career being a huge 145 pounder fighting girls that aren't even in that weight class. So yeah, nearly a 1/3 of her fights have been against girls who have even competed at 125 and most of the rest at 135.
If 1/3 of Ronda's fights were against 115 pounders we would never hear the end of it.