Line 6 is used by TurboTax to allocate the Family HDHP contribution limit between you and your spouse. Line 6 may or may not be the same as line 5, and it is not something to worry about.
"Line 6 does not give us the maximum family coverage from line 5 but only the amount that my husband contributed to his HSA. " This can happen as part of the allocation - TurboTax knows how much your spouse contributed so it allocates just enough of the Family coverage to cover that amount. The rest it allocates to you.
Essentially, you should not read the instructions for the 8889 and compare it to what TurboTax is doing, because the IRS instructions are discussing philosophy while TurboTax is handling the actual computation.
What's important is what appear in the final results for the 8889. Do you have any concerns about the final results for the 8889?
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