Exporting a graph, some data is pulled through as 0 instead of their values

I am trying to export a graph where the values can be seen quite clearly on the graph, but they are being pulled through on the export as 0%.

The data is definitely there as otherwise the graph wouldn't work.

Any thoughts?

There are 3 columns coming through as 0. These are all calculated columns, but there is another calculated column in the graph which seems to be pulling through fine.