Some of these strategies have been trading for months with 0.5 position size. I don’t think the issue is with manual trading but with auto trading at market price at end of day.

Strangely I have just noticed that one strategy that (unusually for me) trades on the DJI 15 min has a first trade position size of 0.5 but was trading  position sizes of 1.0 prior to the IG server crash. It then suffered two open trades that IG closed by mistake when they were supposed to fixing a bug with another strategy. After this the strategy started trading at 0.5 position size!

This is a different issue that I don’t really want to dilute my non trading strategies issue with at the moment but I will send a report in on it when this issue is solved.