Bem-vindo, Carlos!
"Wax" covers substances that differ chemically. Some are strict hydrocarbons (obtained from petrol) and should mix badly with a di-alcohol while others are fatty acids, alcohols or esters (obtained from vegetable sources) which might (I didn't try) mix better with the diol.
"Paraffin" too is less accurate in normal life than in chemistry where it's generally understood as "alkane".
The flash point relies with the vapour pressure, which alcohol or acid functions lower markedly, more so than the already badly defined molecular weight, so a nonrepetitive flash point is to be expected.
Please take with mistrust, my guess is poorly substantiated here.