This is just a situation where terminology is being used interchangeably. It is more customary to say that a variable "loads on a factor" or principal component (PC), rather than a factor loads on a variable (PC). Specifically, however, it's the same thing. Loadings are correlation coefficients, essentially between an original variable $X$ and a factor or principal component $F$.
It's better to get into the habit of saying that an "original $X$ variable loads on a factor (or PC) with loading 0.65" (and not ever saying a factor(PC) loads on a variable).