Ordering of Stacked Bar graph report

Ordering of Stacked Bar graph report

I have just created a stacked bar graph on SDP 7009 to show requests for a single department based on priority and whether the requests were in SLA or not.
Along the x-axis I have priority, with count on the y-axis. (Report is attached).

However, the ordering of priority just seems random. It is not in Priority order (order is 5, 2, 3, 1, 4) and they are not in count order (Priority 5 has 53, 2 has 2, 3 has 4, 1 has 3 & 4 has 1).

What is going on and how do I get this to be in either priority order or count order?




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