Agnes VON MEISSEN, Burggräfin - Incorrect timeline

There is definitely something wrong with the timeline of this profile.

Currently listed as born 1280 to parents born 1246 and 1258 which looks OK.

However being mother of Sophie (b. 1275) means that either Sophie's birthdate is incorrect (but cant be too much later as she has her own son born in 1305) or that Sophie is not the daughter of Agnes.

The GenealogieOnline references are presumably also wrong in this regard so other sources are required I feel.