When a field is filled, the entered value disappears. What could be the cause?

Also, the fasting insulin value disappears when you add in a number.

Please advise.

 Hello, 

I apologize for the inconveniences. To solve this problem, you could consider reviewing your conditions and revising the condition that limits the entry on the mentioned field. 

See image below: 

I hope this helps.

Please, let us know if you need anything else.

Thanks.