MKV dvd file

Im adding MKV file made from dvds and all the ones ive done today say SD and not 480p what could be causing this ? all the ones i did prior to today all say 480p THANKS

please give an example mediainfo XML from one such a file

Th
is a 720x480 shouldnt say 480p instead of SD ?

Perhaps the server changed the display option - 480p is SD (standard definition).

I just
added this and it says 480p

You should post a mediainfo xml file like Otto recommended.