W4 married filing jointly- abnormally high allowances per IRS Calculator

Hi there,

I used the IRS withholding calculator located at https://www.irs.gov/individuals/irs-withholding-calculator which is advising that I claim 8 allowances (based on 2016 taxes to date entered).

Does this seem abnormally high to anyone else?  For reference I had been claiming 1 allowance before.

I am worried this is flat out wrong, but I did enter all info accuratly into IRS calculator (attached results as image).