What can I do if the status of the window/door sensor is not synced with the physical status in the Wiser by SE App?

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Position as such so that there are not too many walls between the window/door sensor and so it is near to a mains powered device (ie a dimmer) or gateway.
Take care that there are no metal plates in the line of sight between the window/door sensor and the nearest mains powered device or gateway
The window/door sensor should be installed in that way, that the front of the sensor part is directed towards a nearby mains powered device or gateway.
The distance between the window/door sensor and the nearest mains powered device or gateway should be as short as possible when the window or door is closed.
Be aware, that the distance between the sensor part and magnet part could be up to 34mm to indicate "OPEN" depending on the material that the window/door sensor is installed on. It is recommended to perform some tests before you fix the final installation.