Do you have any features where the value in the Situation field matches the values in your symbology?. Just guessing here; have you updated the Situation field so that it's values are 1 through 6. If you have a domain, your values have to match the code, not the description, for the domain, even though the description is what shows up in the attribute table. So if the actual value in a field is 'AREA DOADA', for example, instead of 1, it won't display in your symbology except as 'All other values'.
If the Situation field is text and you're domain is numeric based, long integer for example, you'll need a long integer field for the domain. If your domain is text based, and 1, 2, 3, etc., are actually text and not numeric, you'd still need to set them to 1, 2, 3. See if that helps.