It is a characteristic of every VAG manual gearbox I've owned since Mk5 golf.
You can perform a reset of the manual gearbox mechanism. I used to do this twice a year. Once in winter and once when the temperatures rose in spring.
Workshop manuals here: look for one titled 6 speed manual gearbox. Don't need special tool. 5mm drift, Allen key or nail will suffice to lock the gear shifter in position.
Hi All! I obtained these a few months ago, and they've been a great use so far. Here's a link to all of the Seat Workshop manuals for the
Leon Mk3 3dr/5dr. https://drive.google.com/drive/folders/1M4ofxxMgsFjE7hNWg6l4KuifelmdMUu0?usp=sharing...
www.seatcupra.net
Video here may also
help - principle is the same: