Yeah, I had one stock I was trying to buy and it was up ~30% from $0.10 to $0.13 x $0.16. The most they would let me bid was $0.12xx (less than the bid), despite over 100k in volume. It's something based off the prior day's close. You have to get a CSR to uncap every single order that you want and then you can't modify them or it comes back. I will use a different broker next time.IB has a dynamic "feature" that's so restrictive it sometimes won't even let you hit the bid/ask or put in a market order to close an existing position if their algorithm in its wisdom decides the spread is too wide. Try some out month corn futures orders on the paper trade account to test it out.