The input control shows the wrong value even though the check item shows that the correct value is

I wonder if anyone has experienced this before.

I have a C # .net application that creates a html page including some pre-filled input fields.

The problem is that sometimes some of the input fields don't have the expected values. This seems to be happening in a rather random way - at least I can't figure out the pattern.

I am working in Firefox and when I click "Inspect Element" for one of the input fields, the inspector clearly shows the correct expected value in value = in HTML, even though the wrong value is displayed on the page.

I don't know how to fix this problem.

Any ideas? I would be very grateful for any help.