Thanks for the replies
The attached screenshots show the same instrument, a standard stock, with the gap showing on the daily chart on IG, but a full bar in the same place on PRT, and also shows the 5 minute chart on PRT where the gap should be. I was watching at the open aware of where the price would gap to, and saw the full bar appear as soon as the markets open (note the time circled), where it should have been a gap.
This must be a technical issue as it has only started happening recently.
