Ok, I figured out what the problem is. If you get a partial fill on your order, when it would normally auto delete the now executed order, (the Configure, Order, Auto-Remove Orders), it shouldn't since it was only partially filled, but it goes ahead and removes the remaining any ways. So say you are long 5 contracts, put in a sell on all 5, but only 3 sell, the 2 remaining don't execute for whatever reason, the order removes itself as if it had filled completely and you are left long 2 contracts. But for some reason they also don't even show in your position column. But the unrealized profit column continues updating since you are still long 2 contracts. And if you check the trades executions page, it correctly shows what executed, in this case the 3 contracts, but won't show the 2 contracts you are long since they don't show up there. Click on the summary tab though and it will show you still long 2 contracts.
How to fix it? Don't know. Could try clicking on Configure, Order, and uncheck the Auto-Remove Orders. That way if you get a partial order the rest should remain until filled since it won't auto remove itself. Of course you would have to do your own house keeping, manually deleteing the filled orders. That might work. I'll give them a call and let them know what the problem is. Then they can fix it. But until it's fixed, check your trades executions page to confirm all orders and quanity, and check the summary page to make sure what your positions are.