Selecting summarize by policy rule,results in the detection rules being listed twice.
DLP Enforce
There are several criteria which will cause detection rules to be duplicated in that view. In summary, different policy versions with different policy complexities (i.e. a policy version with a certain data identifier, and another policy version with the same data identifier and a protocol rule) will be moved to different lines when you summarize by policy rule. Likewise, two different policies which have the same detection rule will also be separated out onto separate lines in the summarization page.
This is expected behavior for DLP and does not indicate any failure on the console.