Changed the birth and death infos and updated the burial info. It would seem someone may have had the generations confused, in the pedigree view Edit.
Slip a generation or two... with all of the same names... when it gets really early in the morning, after all nighters. I didn't make this error myself, but I can sympathize. 😉
I added the link to sources and pasted it into the about section, under his profile.
https://en.wikipedia.org/wiki/Sancho_III_of_Castile