Timechart not displaying for some selections despite having results. It's invisible for some reason

I have a timechart dependent on a dropdown at the top of the dashboard that selects the customer to show the results for. One customer makes the timechart go invisible when they are selected but when I open it in search it shows fine so I know it is gathering results. This doesn't happen when other customers are selected, it's just this one so I can't figure out why it's happening. I do have some formatting on it through XML but can't see why this is happening with this customer but not others. Here is the XML for the panel: index=ermi IncludesUnitList=0 AggregateERMIScore=* |rename a_customer_code as eRMI_code |join type=left eRMI_code [|inputlookup master_lookup.csv] | eval t=if(CSA_name="$toktrust$","Selected Trust","Other") | timechart mean(AggregateERMIScore) AS ERMIScore span=1w by t |rename "Selected Trust" as "$toktrust$", "Other" as "UK/Ireland average"$field1.earliest$$field1.latest$ellipsisNone0collapsedvisiblevisiblelinearlinear0inheritline5010areaconnectnone0.01defaultshinyall00ellipsisMiddletopeRMI Score300{"$toktrust$":#11a88b, "UK/Ireland average":#ea9600}