In the First Posuk it says:
וירא בלק בן ציפור (And Balak the son of Tzippor Saw)
no mention of his Royal status ,later on in the Parsha it says:
"ובלק בן ציפור מלך למואב (Balak the son of Tzippor was a King of Maov)
What happened that only later the torah tells us that he was king?