I see this quite a bit here on BA…The basic quick answer is you have duplicate geometry…
SVG format makes the Outline a curve, it also places a curve around the fill portions… so you will end up on import 2 sets of curves around the outline of each section…
Went over this several times in many threads…
I would try this add-on by SpecIO ( free) it works a lot of magic on an imported SVG!!