Potterwasp

Please tell me im not doing something daft! I cannot move stops. I have searched the forums and have seen a few others who are or have experienced the same. Moderators have suggested the change is too close in steps or that there is good/bad news imminent or that price changes are to volatile at the time of trying to change the stops. Im not convinced. In my demo account i have 11 positions open, a few shorts but mostly longs. Stops are "Normal". Markets are FTSE350 and one Nasdaq. I have tried moving the stops tighter and broader. I have tried incremental changes in the Positions page. I have tried opening the stock page and dragging the Stop slider. I have tried tapping in a new stop in the Positions page. I have tried all my open positions both tighter and broader. I have tried adjustments while markets are open and on the closed market Nasdaq position. I can see on some open trades where i move the Stop slider a gray band below the current price. I guess this represents the spread and/or 2% limit and when changing stops previously, this is the limit i could change the Stop to. When trying on a stock open page I too get the popup confirming amendment but it never actually changes. It doesn't matter if I click the screen, click away or just close the tab. When I check next the stop has not budged an inch. I have changed stops many times before but today none of my open trades can be stop amended.