Interesting bug with the new Android challenge setup (May be MotoG4 and equivalent specific, but I don't have anything else to test on, yet).
When you've completed all the challenges in a slot, when it is allowed to respawn a challenge after a given time, it starts with Hard first (so the progression is Hard,Medium,Hard). The crates shown being opened are White, Green and Blue, implying the first Hard Challenge is actually still opening the easy crate. it may just be bad visuals or alignment, but if you were to pay to reset the challenges, it'd start from Easy as normal.
When you've completed all the challenges in a slot, when it is allowed to respawn a challenge after a given time, it starts with Hard first (so the progression is Hard,Medium,Hard). The crates shown being opened are White, Green and Blue, implying the first Hard Challenge is actually still opening the easy crate. it may just be bad visuals or alignment, but if you were to pay to reset the challenges, it'd start from Easy as normal.