Stop Loss error

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I presently have 3 open trades (1 lot each) by my EA at different prices but when I try to manually change the stop loss for one of the trades (by right-clicking the trade and selecting "modify or delete order"), the stop losses of all trades (with different order numbers) changed at the same time. How should I do it so that I only change the stop loss for one trade and not all - does the problem lies in the magic number?

Appreciate all help. Thanks!