If I took a Roth IRA distribution that was less than the amount I've contributed to it, shouldn't the distribution be tax-free?

I contributed $2000 in 2011 and $1000 in 2012. Withdrew $2500 in 2017. Form 1099-R shows distribution code J. When I work through TurboTax steps for this distribution it shows a 10% tax, so I must be misunderstanding one or more of the questions.