Report has data, but export is empty



When looking at Actions > Pages hierarchically, then looking at the row evolution of a single page, I can see the visits of the past weeks to that page. However when I try to export this in any format, I end up getting no data at all.

If instead of a single page I look at the row evolution of a group of pages then I do get the data in the export. But since I am only interested in one of the pages of this group this is not the data I want to use.

I am not sure if this is normal behaviour for Piwik or if it is a bug?

ETA: Using Matomo version 3.4.0

Exports empty on Behavior->Pages->{subpage}->Row-Evolution