youtube api does not return all channel videos

I'm trying to get all the videos from a certain channel, but the Youtube API says in totalresults the total of videos, but in paginations it always shows less than the total. Ex:https://www.googleapis.com/youtube/v3/search?key={key}&part=id&maxResults=50&channelId={channelId}&order=date&regionCode=BR&pageToken={page}

I'm trying channelID = UCZhYB1iqqaL2gUvs452yvsgpage = CPQDEAA that would be just the tenth page (50 records per page = 500), and it has 824 videos.

Could someone help me, please?