Those are trucks !
Normally these are filtered OUT however at the moment there is a hiccup on FR24 . I have no doubt in a few days they will disappear again
There are anomaly’s like this with that site all the time. Ghost flights, and light aircraft landing at parallel airfields for instance Denham and Northolt often show up as landing at Heathrow in the UK .
RFS = Road freight service and one truck can carry several differing “flight numbers”