If $4,668.40 is the total of the regular $1,250 distribution and the distribution for the return of $3,398 of the 2021 contribution, yes, that means that the income attributable to the $3,398 was $20.40.
I don't know if Vanguard show the net contribution for 2021 or not, but it seems that they are just showing the original amount $6,000 contributed and it's up to you to subtract the $3,398 to arrive at the current net contribution for 2021 of $2,602.
