SYMPTOM:
When exporting a Report Services document to PDF format in Strategy 9.4.x, some of the graphs are cutoff or appear incomplete, as shown in the screenshot below:
HTML View:

PDF View:

CAUSE:
By default, Strategy 9.4.x utilizes Vector Graphs for images when exporting a Report Services document to PDF, these support less colors and less combinations than bitmaps, but are smaller in size and can be resized better. However, certain combinations of colors could be displayed incorrectly.
ACTION:
Export the graph as a bitmap following the steps below:

The only drawback to this workaround is that the PDF will be slightly bigger in size. Another option, is to change the graph's colors and size looking for a different combination that the Vector Graph image can display.