as long as there are both buyers and sellers at the quote then the price will remain fairly stable
when one side or the other dries up then the price will move to where there are both buyers and sellers again
Markets hunt for traders
apples pears and bananas
at what time did you make that comparison ?
Index closes at 4:30
IG close at 9pm on fridays but is their Index equivalent taken from Futures less Fair Value. Futures close at 9pm
Bloomberg will be the Futures Market quote. probably June Expiry