The Euro History class can only be Honors Level (HP) or AP or Regular. If reported as AP, then HP will not matter and it is not a mistake.
Regarding the CL, is it possible the Marketing class is not UC transferable so it would not be considered CL? Did you check assist.org to see if the class is UC transferable?
Regarding the seminar program, I am not familiar with that program so what exactly do you do in the program that is different from the other HS students?