what costs do you think relate to 2019? the only one I can come up with is real estate taxes. in some places, taxes are assessed in arrears. thus In say Illinois you would pay 2018 real estate taxes in 2019. on the closing statement you would get a credit for this for the portion of 2018 you didn't own the home. But this would be a reduction of the 2018 taxes you paid in 2019. the closing statement should indicate what period is covered.
there is another possibility. perhaps the seller fully paid for the 2018 taxes, in that case, there would be a charge for the portion of the 2018 taxes that you should have paid.
unfortunately, we can not see the closing statement so this may be way off base in your situation.
most closing costs become part of basis.
perhaps if you detailed those items that are for "2019", we could give you a better explanation.
