I have the same problem. It seems like a race condition as the PDF gets generated before the data is fully downloaded, so it's a matter of which finished first the data arriving from Splunk and how long the PDF takes to render.
The issue I am seeing is that I have multiple saved searches that run once a day at the same time. I have a dashboard that has a panel for each of the searches. I created a scheduled PDF to be run well after the saved searches are run. The PDF that gets delivered only has data in the panels that have less than 100 or so rows (this is just a guess). Empirically what I've seen is 10 rows of results show up fine but anything over 180 rows of data does not show up at all.
I have not found a solution for this.
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