If the modder who did this used too little water, or even too little water when mixing with the Annitas paint it can indeed cause the paint to be too soft, and not hard as nails < This is how it should be when mixed right.
The modder also needs to shake the bottle quite hard so the internal mix of paints are fused together otherwise when pouring out the paint, one or the other will come out, not all/mix.
I know the above from experimenting, and learning the hard way with Annitas