Why is there coffee grounds in your coffee?

It could be for a couple reasons:
The coffee filter being used is the incorrect size for your coffee maker.
The ground coffee could be too fine for your filter or type of coffee maker
Could have too much ground coffee in the filter
The ground coffee wasn't leveled off in the filter
May need to check if coffee grounds is in coffee maker

Most times its a simple fix. Pay attention to your filter and how you put in the coffee grinds.