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I don't have a WM Discover, just a regular Discover IT card.
But if it goes by the rate of the MORE card it's .25% CB on the first $3000 then 1% on everything beyond the $3000.
I don't know that for sure, but it would make sense by the amount you have so far.
Up to $1,500 spent annually on purchases: 0.25% cashback
From $1,501 to $3,000 spent annually on purchases: 0.5% cashback
Above $3,000 spent annually on purchases: 1% cashback