Promotion wrongly applied when combining 'Get cheapest for free' and 'Fix price" promotions

Description

Precondition: There are 2 promotions:

• Buy 3 mens at $30 (Fix price), redemption limit for customer - 1 per registered user, first priority
• Buy 2 mens get 1 free (Get cheapest for free)

Case 1: No exclusion

1. Log in to Quicksilver.
2. Add to cart 6 Puma Red (price $52.50).

Expected:
Order total should be $115 (Price of 6 items after applied first promotion is 10, 10, 10, 52.5, 52.5, 52.5. Price of 6 items after applied second promotion is 0, 10, 0, 52.5, 0, 52.5 => Total 115)

Actual:
Order total is 177.50.

• Note: Issue does not happen if you add 1,2,3,4 or 5 items to the cart. It only happens when you add 6 items to the cart.

Case 2: 2 promotions exclude each other with Unit level exclusion

1. Log in to Quicksilver.
2. Add to the cart 6 Puma Red (price $52.50)

Expected:
Order total is $135 (Price of 6 items after applied first promotion is 10, 10, 10, 52.5, 52.5, 52.5. Price of 6 items after applied second promotion is 10, 10, 10, 52.5, 0, 52.5 => Total 135)

Actual:
Order total is $187.5. Only the first promotion is applied.

Note: The issue does not happen if you add 1,2,3,4 or 5 items to cart. It only happens when you add 6 items to the cart.