When Price Box Turns Yellow

[Forex Trader]

I've seen price box turn green and red in the trading window, but what does it mean when it turns yellow?
It seems that IBFX keeps skipping my orders.

Whats up with the yellow box?

[Forex Trader]

When you open a new order, the yellow button is disabled. When you close your order, the closing information is written on the yellow button.