mx125 - have you set the correct time zone and trading hours? Someone had previously posted about that as it was a problem. You need to set the trading hours as 9am to 5pm only..anything outside of that and it skews the trading as HDB says.
Addendum to Rules :
If you want to trade after hours, switch to International mode on IG, then open charts for S&P or Dow and use same chart data to pick up signals on Dow or S&P. Once either gives the signal, switch back to local and do the trade using the Alsi.