This wasn't my first time but it seemed that IB placed orders with their own markup on option orders. Here, I placed a short call on IEP at $6.25 but IB placed it as $6.30. Does anyone have a same issue?
Look into your order routing settings https://ibkrcampus.com/trading-lessons/tws-order-routing-settings/ If you have the "prefer fill" option it will try to fill at the nearest price available.
Options over 3.00 in most stocks can't be quoted in nickels. It appears instead of rejecting your order they adjusted it to the next allowed price.
No, that effects which option exchange they route to, not the price. the price issue as said above is due how you trying to quote at a disallowed price due to the increments for the contract.