TT is saying I overfunded my HSA.

Here are the details:

2018 W-2 Line 12 W: $1,470

2017 W-2 Line 12 W: $450.25

2018 1099-SA Gross Distribution: $1,723.85

2017 1099-SA Gross Distribution: $171.76

My deductible is $1,800 (self) and out-of-pocket max is $3,000. 

I have only made contributions through my employer (automatic deduction from payroll) and I have  taken distributions for qualified medical expenses. I do not have a Form 5329 on my 2017 tax return. 

My questions are:

1) Do I have a high-deductible health plan?

2) How could my HSA be overfunded?


Thank you!