A refractometer is not accurate once fermentation starts and alcohol is produced.
Throw both instruments over your shoulder and use other methods to tell when a Rum wash is done.
Eyes .....Look and watch, is the wash active in any way ......or completely still/ dead...........look very very carefully.
Ears .... hold an ear close , very close....can you hear it fizzing?
Taste......dip a finger in.......suck on finger.....does the wash taste at all sweet , or is it dry / tart/ sour to the taste?
In short learn to use your senses.
My gut feeling is that if it isn't finished its because the wash hasn't been kept warm enough.
What you have made is not this recipe, it is a hi bred Molasses/sugar concoction, for that reason your questions would be better asked elsewhere, in a thread of their own.
Edit Posted same time as Yummy