Thanks for your reply - I contacted them, they assured me it IS correctly reported that way, but couldn't give me any tax advice about how to handle it. I did find the following reply to someone else's previous question:
"Any HSA contribution made in 2017 should appear in box 2 of the 2017 Form 5498 regardless of whether the contribution was for 2016 or 2017. If this contribution was made for 2016, it should also be present in box 3 of your 2016 Form 5498-SA. The HSA contributions for any given year is the sum of the box 2 and box 3 amounts on that year's Form 5498-SA minus any amount in box 2 that represents a contribution reported in box 3 of the previous year's Form 5498-SA." (dmertz)
I'm taking that to mean I should subtract the 2016 amount contributed in 2017 from the amount reported on the 2017 form, and report that amount, which is zero, in TT.
