I am constantly getting what I call 'zombie' alerts - these are Price Level alerts on a market, that keep on triggering long after the first (and only) time they are meant to, long after being de-activated by the system (greyed out), and even after being deleted. And they keep going at random intervals, for the rest of that day that they were set. I can even log out of IG, then go back into the Spreads system, and it will trigger immediately for that alert. Note, I am NOT talking about Indicator Alerts that are set to occur more than once, I am talking about one-time-only Price Level alerts. This phenomenon happens regardless of what browser I use, and has been going on for a long time, maybe a year.
Has anyone experienced this, or can explain why this might happen?