There are certain operations you can perform (simply saying) "From outside" of a component. You can
rotate, move etc. (obviously)
you can scale
you can paint...
When doing these things "from outside" (i.e. you do not enter the editing context), they will not affect the component definition, just that instance.
Make another test: insert a (non textured) component into the model then paint it with a colour. Either when you insert another instance or you save as... the colour will not be repeated on the other components.
All in all, in your case, you should have edited the component (double click), select all "inside" and scale the geometry itself in order to transform the definition itself.