Conditional Logic: Sometimes "Update/Calculate Field" condition is not adding the value to the payment field.

We've had this site up and running for a couple months and now today everything seems off with the calculations. Toggle back and forth between and one time and monthly recurring entering an amount at the time. It will fill the amount in the payment field half the time, half the time it goes to 0 and highlights the payment box saying this is required. What changed?

I have checked your form and seems to be working fine, all the times that I filled the donation amount it was populated on the payment field, however, I noticed that in one of your forms there are some conditions that may be affecting this functionality.

I would suggest you do disable or delete those conditions and try testing again, your form should work as normal. I tested using the direct link to your form as well as the direct links to each form that you have embedded on the main form, each time I tried it worked. 

This is the form with the conditions: http://www.jotform.us/form/60216900967154. 

Do let us know how it goes.