Question about Dynamic Profile pictures

Herro. Just a quick question to be honest: When I venture to my profile page, I sometimes see the champion in the background whom I have highest mastery points on. "Your friends will see your highest mastery champion..." is the description. But sometimes when I check my profile page, it's suddenly a DIFFERENT champion. Then the description says "Your friends will see your most played champion in the last 20 games" or something in those lines. How come it keeps switching...? Honesty I'd love to have my highest-mastery champ in the background all the time really. But how come it randomly switches to my 'most played' champion?
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