does turbotax applies higher tax rate for dividend?

I am filing married jointly. based on my household income, I supposed to pay 15% tax for my dividend income but turbo tax charging more. e.g. before entering dividend income I have a refund $3771. But after entering $4721.51dividend refund comes down to $2883. That means. for $4721.51 ordinary & qualified dividend total tax is $888 which is 19%. what am I missing here? any help is appreciated.