ok - sorry - always a bit harder in a foreign language. you are fully right they have their sites and fa has other sites so sometimes fr24 or fa can track and mlat - sometimes both.
the thing i do not understand is: if i sit in front of my skyview and see huge parts of the track that fr24 shows i just can see it because fa is doing mlat (partly with my actual data) but i cant see the flight on the flightaware website?
hmmmm - hope you understand what i mean …
here in the picture at least this was the part fa and i made mlat - but this part did not show up on website
maybe im too daft to use the fa online website … but just don’t know