Candles sometimes closing too late. MT4 or broker issue?

Hello

Sometimes when watching 15min candles, i demo trade with Alpari, they close too late. Is this because of lack of incoming tics?

If that's the reason, is it because the broker have "frozened" the price update flow, or just because the price doesn't move at all (which would be strange as the candle sometimes closes 3 mins late, which would mean there hasn't been a trade for 3 mins that change the price 1/3rd of a pip)

That's really weird, I've never heard of that happening before...
Could it have to do with your network speed?

incoming ticks

Seems as it is a lack of incoming pips, since there's no problem placing a order.

You have to watch the MM market at a slow hour, i watch it around 00am EST

Yeah, sometimes this happens, though I'm not sure exactly why.