SPDR S&P 500 (SPY)

[DowDeva]

Thinkorswim alert! I don't know if this was just an anomaly, but for the first time today in my experience with ToS, a market order I had put in for an option was held for what seemed like about 20 seconds before it was filled. I was actually wondering if I had remembered to actually place the order. The price of the option during that time was raised by .17 cents, my order was filled and then the price was dropped down to where I had wanted to fill it.

Many people are complaining about them, including me. They hold deposits now for five days, for instance and other things too. But I had never in my long trading career had this happen before. Etrade yes, but not Tos.

Does anyone know how it could have happened? These trades go by in a millionth of a second and are implemented by machines, it's not like there's some human on the other side out to get me.

I just can't figure it out, and don't want to point fingers yet.