You were given priority but other students may have higher priority (e.g., freshmen, graduating students, and OUR registration volunteers have higher priority than college/department registration volunteers). Although being given a priority enhances your chances of getting your desired classes compared with most students, it doesn't guarantee enlistment in your desired classes due to limited slots.

If you think something is amiss, please check with your college/department if the person concerned submitted the college/department registration priority list to the OUR. Unless the OUR receives the priority list from your college/department coordinator, the CRS will have no information on who gets priority enlistment privileges during the pre-enlistment runs.