OLD CRAP VIDEO ERROR?

In your 2012 crap video, you gave two betting options of either betting the 4&10 place bet at $5.00 or buying the 4&10 at $20. In your 2016 video, you only mentioned the one bet on the 4&10 at $20. In your 2012 video, you also mentioned buying the 4&10 for $10. If I buy the 4&10 for $10.00 (2:1), I would win $18.00. If I just put $10 on the 4&10 place bet (9:5), I would win $18.00. However, in the 2012 craps video, you said the buy bet would be $19.00, not $18.00. Was that a video error or am I doing the math wrong?