The sequence does not have 'double' notes, but something I noticed in the track was that the 16th note Hi-Hats were a few ticks longer than a 16th note on a lot of the hits, so you got an overlap between note-off and note-on at the same pitch... Roland (amongst many other synths) do not like to see this. The solution is to shorten all of them a few ticks.

But there is still the problem of an unending line of 16th notes at 64 velocity. Try applying a 16th note groove template that has a nice feel to it and apply the dynamics of it too, and it can be made better... (in fact, apply it to the whole drum track!).