System flaw?

Is this a bug?

When I see the system page for a system (I am using Firefox), negative amounts are appearing in parentheses, but the color is green rather than red. I don’t know if this happens always, but it happens a lot…

For example in ProShares:

Started Buy Power Cash Long Eqty Margined Open P/L

$100,000 $68,833 $69,538 $123,330 $124,035 ($1,410)

The ($1410) is green, but should be red.

I am using IE and here it is green too. But in some other systems it is red as it should be.