question about cal topo and motion x

I just bought a lenoveo 10 inch a-10 tablet. an installed motion x got the cal topo maps and loaded bunch of the tiles on. Noticed though that I didn't get some tiles loaded so there were some gaps ( this is why I am testing it) on a recent drive from sd to malibu. when I was dialed up in scale ( more detail) some tiles that id not load weren't there. but in the same area when I zoomed out I would have coverage . has any one experienced this ? can you explain to me?
 

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