Product total showing but not being passed through

I have a donation page with two "product" fields and a "total" field. The first product field's type is in the form of radio buttons with one of the options being "other." The "other" option is set up to be the driver of conditional logic on the other product field. This other product field is set up to allow the user to input their desired donation amount as opposed to selecting on of the predetermined amounts listed in the first product field. The problem seems to be with the conditional logic. If I allow the second product field to be visible (no conditional logic applied) and type my donation amount in, then the "total" amount is being passed through no problem. However, if I apply conditional logic as stated above then the "total" isn't being passed through. Any ideas?

Hey Rob,
I figured it out....but thanks anyway. I had left the value for the "other" option blank......I went back and make the value $0.00 and it works fine now. Guessing the " " was throwing an error when tallying the "Total."