Yes, this is right, I think all washing machines operate this way.
The standard cottons cycle is for the full weight of the machine, whereas the other cycles are for lower weights. Reason being, different fabric types, water levels and agitation profiles of the different cycles.
The weight capacity rating of a washing machine is a swizz anyway, as drum volume comes into play as well.
For example, everyone will agree that a double duvet (not duvet cover) will not weigh anywhere near 9kg or so in weight, but it will fill your entire washing machine drum, not allowing anything else alongside it.
Also, I have had a couple of 9kg washing machines, but the drums have been completely different volumes (eg a Bosch was stubby and deep, a Hoover washer drum was tall and shallow) so even though they are advertised as taking the same weight, I could fit more in the Bosch.
So my advice would be, don't just look at the weight rating, look in the drum to see how big/deep it looks.