Portfolio order

I am using the Portfolio post feature to display a grid of company leaders.
When opening the first bio, I would like the arrow on the right to move to the next bio in that row, but instead the right arrow moves the the previous bio.

I am using the custom post order plugin to sort the bios in the exact order, and I have the date for the first bio as the earliest date (but changing the post date did change the order in which the portfolio item arrows progress to the next bio.

http://cascade3.cascadeenergy-test.com/company/leadership/

I hope I explained this well enough. Any advice you have would be helpful.