It is assumed that paraffin and Kerosene are the same here but here they are not here and in the Pacific, which would cause confusion for people crossing the Pacific and visiting Pacific island, NZ and OZ along the way.
I have had to fix a few Paraffin appliances that have used Kerosene from boats that sailed here to NZ from the USA and South America. The problem is always smutting. Because the smutted fuel is unburnt there are volatile compounds still present which when mixed with salt water, exacerbates the corrosion inside the burner pot. The salt water should not be in there either but Pacific passages are sometimes very exciting and not all installations are perfect.
Maybe those owners bought kerosene in the Pacific islands on the way here? It would pay to check anywhere you buy is my suggestion. Diesel appliances are more expensive but you can buy diesel anywhere and the small regional differences in content don't seem to make any difference.