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If you can move the gate manually, or crank it open and/or shut manually, I advise that you try to manually open it, noting whether resistance increases to a significant extent, in the workings of the gate as it opens, at about the half-meter mark.
Look on the opener module for a 'strength' or 'force' adjustment/setting, and set that a point or two higher, if the gate really doesn't resist more at or near the half-meter mark. Then try the opener again.