This is now fixed. Thank you!
Even though I have 9217 points I can not purchase the Gorgonash. The screen just refreshes without deducting any points.
Additional info:
It appears players can purchase the Gath with and without owning a preexisting legendary unit. Another player in our group was able to purchase the Gorgonash but they do not have a legendary unit. I already have a legendary unit ... could this be a potential cause of the bug?