IB percentages not quite accurate?

I'm finding the limit down at 5% actually showed -4.6% overnight.
The circuit breaker at -7 shows -6.6 on IB YM charts.
Is it taking a mid price or something?
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Sounds like your data is more accurate than mine.
I use 3 chart services + a notebook; 2 out of the 3 were off/off today. So let the profits ride on SDOW + related[out now] .
UDOW , maybe good, I cant get good quotes on that small investment.
Best way I've found on that= measure all against your notebook in order not to get confused.
I remember IBKR was off more than that % on volume , but consistant, so its OK:cool::cool::cool::cool::cool::cool::cool:
 
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