Polygon not filled completely

[anjansapkota]

Hello guys,
I've been working on a geology project lately. And I'm using earcut in my project to fill up the polygons. It works most of the time just fine but there are about 5 in 2000 polygons that are not being treated properly by earcut. I'm letting you guys know about this issue, and also, if there's a solution to it, please let me know. I'm using it in Node.js.

I've attached the geojson along with this post. I've also attached images of how it looks right now and how it should look.
Thanks for all that you guys have done!

Polygons.json