Catalog Price Rules, % value not showing correctly at cart/checkout

[remoteONE]

Testing PS
Test product: Hummingbird printed t-shirt,Size: S,Color: White
From quantity 1 discount = 5%
From quantity 2 discount = 10%
Discount for Custom Group "Trade"
 

On products Page the discount is updated and changes from -5% to -10%

In the CART, the price does recalculate for Qty as youincrease to Qty 2, but the % still shows as -5% ! It does not update to -10%

Refer to screenshots.