If you go to the source, there's no inconsistency in the numbers. They aren't obliged to add to 100 percent, because it's a "favorability" rating, not "Which candidate will you vote for?"
I think it's highly significant that Trump has better favorables than Yeb. I think the thesis that legals came here to escape the illegals is a good one. There's also the fact that Mexicans and Central Americans respect a man who acts like a man, and knows how to project power. Liberals sneer at "machismo." Latins vote for it. So do other normal people.