These aren't Stop Limits 'STP LMT', but Stop Orders 'STP', that should exit via a market order, when according to IB doc "the user-specified stop trigger price is attained or penetrated".
This is happened live. And i've seen this with Trailing Stops too.
I've checked the ES trades, take a look at the 2min chart, i've marked the two candles with the short entries, it wasn't even a volatile market and i doubt anything got jumped. The exits were made more than four hours later.
