I can't speak to the examples in the charts, but I have experienced similar very temporary up/down movements from time to time with IG, but infrequently. When discussed with them it appeared to be cause by a switch between their underlying futures feeds i.e. which they are tracking. Whilst it appeared on the tick charts, it didn't trigger stops. In other words it was purely a techie charting display "blip" not a "real" quoted price and not a stop hunt. I don't use either high leverage or very tight stops if using SBs to avoid even the possibility of stop hunting etc. Bearing in mind stop hunting happens in the underlying markets in any event around known S/R areas. So place stops accordingly.