Calculation: Tax Calc updates on first drop down selection but not upon change

[Amy5C4C]

Not a seasone Adobe creator.Not using java script, only the simple calculation formats (sum & product).  I have an easy T & M ticket. Adding up material, labor and tax. There are different tax rates dependant on the area in drop down boxes. The first selection of (in this order:) tax, material .. calcs fine. Any adjustments going back to a dfferent percentage will not cal properly and the previous rate is left. Any ideas.

[Peru Bob]

This is the Using the Community forum (which is the forum for issues using the forums).
Please tell us what Adobe application you are using so that this can be moved to the proper forum for help.

[Nancy OShea]

Is this a question about using Adobe Acrobat Pro DC?

If not, which Adobe product or service are you using?

[Amy5C4C]

Yes, Adobe Acrobat Pro DC

Moved from Using the Community (which is about the forums) to the correct forum... Mod
To find a forum for your program please start at https://community.adobe.com/

[try67]

Make sure the field is set to commit the selected value immediately, and also the fields calculation order.

If all of that fails share the file with us for further help.