Stops - Still not working right!

Got shares I bought at 2.32. Current market value is 2.69. Trying to protect my loses my setting a stop at 2.64. Message “The entered price value is too far from the current market price.”

Personally I think its fine, i’m allowing for some fluctuation but locking some profit in. Why cant I decide this, why are system algorithms forcing me to go tight so that an automated sale is a real risk? What is the logic for such tight margins with no ability to user over-ride?