We believe this is due to a temporary shut off in one of the key liquidity providers during rollover.
At the point where the quote stop, the emergency backup quote liquidity providers kick in to fill the gap.
Since we are 100% honest and the servers are not filtered like other brokers, whom, frequently shut off their server during rollover preventing spikes from occurring on the charts,
The continuous price feed mis-match and re-matching cause the spike the occur on the MT4 charts.
This is perfectly normal and should not affect trading.
In cases where extreme spike happen not due to the technical fault of the traders, we will investigate and usually compensate the clients should they have unreasonable losses due to our fault.
We are responsible.