Are there issues with TurboTax and Railroad Retirement tiers this year? RR Tier 1 took 8177.42. My income was 108380.95 6.2% of it is 6,719.62 and calculated is 0? Help

I beleive  I paid too much but why is this software showing me they calculated a withholding of 0 when the tier 1 RR is 6.2% of earnings