Why Purchase Order total field is not updating when selecting products?

Hello,

   I changed the purchase order on my form today to add a coupon, etc.  In reviewing the form later, I noticed that when I bought one of the sub-products under "Sail Mad Logo on Extras" , the subtotal was updated, but not the total field.  I continued looking at the form and testing it, and now the total field is not being updated no matter what is ordered.  Please help ASAP!

It's because of your tax settings. Base Tax Rate and State should have 0 as their value if you do not want to place a tax rate to the items:

Please change to fix it. 

Thank you.  Don't know how it got wiped out, but functionality returned when I entered 0 base tax rate.  Appreciate your fast turn-around!

Thanks again!

You might want to update the title of this question to be more clear.  

Thanks.

Thank you for your response. I have updated the title to fits better this thread. 

If you have any additional questions please let us know.

Thank you!