I have been having the same issue. I found if i change the layout position of the 2nd chart it fixes the problem but it breaks the layout. For example if my first chart is row1_col1 then chart 2 is blank. if i change chart 2 to row2_col1 or row1_col2 or leave it with no layout position it is still blank. If I change chart 1 to row2 and chart 2 to row1 then it is no longer blank. I think this is a bug but I cannot seem to get any one from Splunk to look into the issue or respond.
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