Stops Error
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When a stop is moved to have a trade exit with a loss then the following error occurs. I have included a image. This is using the 'shrink stops' function as the 'modify stops' function didn't work for me either.
The purpose is to have a martingale trade where all the stops are the same as the LAST opened trade. This is only using take profit and don't require stop loss.

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Moving stops too close to current price is always punished by brokers. You should use the 'on trade' tab blocs and options. There you can choose that a new trade is open at the exact moment it was closed by a SL.
On the other hand, please don't spend too much time with martingales. They never work in the long run.