After a confusing series of IRS actions, they have decided to increase the family HSA contribution limit to the original $6,900 for 2018. In March 2018, the IRS announced that a change in the inflation adjustment calculators for 2018 lowered the maximum deductible HSA contributions by $50 to $6,850. This is after they had announced in 2017 the limits would be $6,900.
Now, the IRS has granted relief or affected taxpayers by allowing the originally announced $6,900 family HSA limit to remain in effect. The IRS cited "numerous unanticipated administrative and financial burdens" in response to the $50 reduction.