Table sometimes reports empty, sometimes not

I have a table that sometimes reports empty, but other times not, even though the data going to the table is the same each time. I'm hoping that someone can suggest a way to debug this problem.

You can see the table in action here: https://gtexportal.org/home/gene/ACTN3#ieQTLBlock

The problematic table is the ieQTL table (second from the bottom of the page). Sometimes the table reports empty, sometimes it doesn't. I check for empty with this code:

$(oTable).find(".dataTables_empty").html('No ieQTL data found.');

The table is defined in webpack://.src/mixins/QtlTableMaker.js in function generateIEqtlTable()

I can't understand why the table sometimes displays correctly, then I reload the page and it doesn't.