The average KS cancellation rate is approximately 5%-8%, so I am told. Its entirely normal that a few people back out for a variety of reasons - changing their minds, not having the cash they thought, unexpected bills, etc - and says nothing about the products that they backed.
As it stands, with 4 days to go, you are at about 106% of the target, so well done for this. Even with an 8% cancellation, you are looking at $1956 before Amazon takes their 9%(?).
Congratulation.