Populate ultiple choice field based upon a form rule

Can you state your form rule?  Its hard to guess without some clues.  You can also edit your original question and add a screen shot of the rule.

Did you post a JPEG screen shot?  We can't link through to a file path on a server.

I did. I edited the original question posted and attached the jpeg.

Try unchecking that bottom checkbox in the form rule. Let us know if that fixes the problem.

Unfortunately I tried that and it didn't work. It "sort of" works in that you can edit the record and then it will change but it doesn't change on it's own without editing the record.

Ok, so now I understand. You are not understanding what a Dynamic form rule does. It only kicks in when an individual record is in edit mode. It does not affect anything when the record is not being edited.

If you need a field to change based in the value of other fields when the record is not being edited on a Form, then you need to use a formula field. If the reason that you are not using a formula field is that you need to control the sort, you will need to fall back on results which are numbered. For example,
1.Open
2. in Process
3. Complete