"I declared it in turbotax as $4050 for me and $4050 for my wife."
I take this to mean that your spouse had her own HSA, right? HSAs are owned by an individual, not jointly.
"I see $8100 appears on 1040 line 10a"
Really, it's on line 12 of Schedule 1 (1040), which flows to line 10a on the 1040.
"but on form 8889 line 2 (etc) only $4050 is declared"
Yes, that is the 8889 for one of you. If your spouse also had an HSA, then there should be 2 8889s, one for each of you. And both of them, in this case, will have $4,050.
However, into which HSA did you actually make the contribution? Since you appear to have two HSAs, then you should have entered the dollars into the HSA where you actually made the contributions.
So if your spouse didn't have an HSA, come back and tell us, because we'll need to fix something.
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