Can you provide the XML for that panel? Based on the search it looks like there should be the possible "Transaction Operations" of:
It looks like you are using timechart which by default has a limit of 10 and you have 12 possible values. You can change the limit as needed and even set it to unlimited as well (http://docs.splunk.com/Documentation/Splunk/7.0.1/SearchReference/Timechart). The reason you may not be seeing the additional values is there is no instance of them within the timerange in which your chart covers. They won't appear in the legend if an instance of that value isn't found. Try running the search over another timerange and you may see additional values appear depending on the data.
I am posting an answer and attaching the images of the issue. there are two extraction I am using for same field.
If there is some issue with field extraction then field should not get identified in events also.