Beginner rum issue

[Bipman]

Hi all

I made my first batch of rum following the recipe below to make 15 litres of wash :-

2.6 kilos Molasses
2k white sugar
Warm water to top up
Rum yeast & yeast feed.

Everything went well and it fermented out well. I'm using an Air Still Pro which has served me well with other distills. The outcome of the still tasted like molasses rum and I was looking forward to it as it mellowed. However two days later it had lost the rum taste and now tasted like Spanish brandy, which is no bad thing, but I was wanting rum. Any ideas why it lost the flavour? I thought it maybe because I used white instead of brown sugar.

SPG