Reduced capacity for short haul flight

Just opened a new route from Frankfurt to Florence, Italy with an Airbus 320-200 light, the distance is only 756 km. However the passenger capacity is only 82 PAX for Economy instead of the normal 144 PAX. I have never witnessed this before and the returning flight is totally normal. Any suggestions what’s happening?

Runwa length…
1717 m is not long enough for landing.

Oh wow, thanks a lot!