src_ip is not the problem it is the visual for src_port. in the search app I can use:
sourcetype=snort | top 10 src_port
Which results in the top 10 correctly listed and the % for each. Given the hint you provided and now realizing I can edit the dashboard source code (I'm still learning) I can see the problem. The dashboard is using source_ip, source_port, destination_ip and destination_port to build the report. When I check which fields are extracted I have src_ip, src_port, dest_ip, dest_port, source_ip, destination_ip and destination_port. There is no source_port. changing the dashboard code from source_port to src_port I get a pie chart. So now I just need to figure out why I have a src_port but not a source_port field. Either way, I have learnt some more about splunk and can at least fix the problem by modifying the dashboard.
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