Backtest-Results-Positions-tab-sort-on-Position-doesn-t-work

The Position column on the Positions report for the Backtest Results doesn't appear to sort the types correctly. I wanted to sort this column so Long and Short positions were grouped together, but they stay intermixed. There does appear to be some sorting but it's not what I expect.

To reproduce:
1) Open published strategy 'Dual Donchian Breakout'
2) Run Backtest
3) Click Backtest Results > Positions tab. There should be some short and long positions.
4) Click on Positions header to sort the column

The results don't group the sort and long positions.