Kibana bar graph not showing first grouping

I am having an issue with a Kibana bar graph that isn't showing the largest grouping. Here is the normal graph output:

I notice that I am missing my largest grouping. So i remove dac2 and then it appears:

I have the Panel Setting "Order Buckets by Sum" selected. But it still does not show up unless I have that filter. Why is this and how do I fix it?

Thanks!

Can you try changing from Significant Terms to Terms and see if that gives you the results you expect?

Thanks,
Lee

It worked. Thank you! What is the difference between Significant Terms vs Terms for future reference?

https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-significantterms-aggregation.html