In quote panel, bid higher than ask??

In an options spread on spy stock, in the quote panel, at times today the bid was much higher than the ask. What is going on here?

 

that's why you only trade in 1's. its called locked markets look it up

 

Try to execute. See what happens.

 

What I suspect is that the buyers don't want to buy only 1 contract. They might have "all or nothing" orders, with a quantity higher than 1. Thus the order for 1 contract at 0.28 is not getting filled.

 

IB's spread quotes in many of the active securities are often wrong (behind) in these fast markets. ie SPY, AAPL etc . they are constantly crossed but they are incorrect