Updated plugin to latest version. Removed % symbols. What I see now:
Customer adds $65 to cart. Tier 2 20% discount applied
Customer adds another $65 to cart. Tier 3 25% discount applied (previous discount removed)
so far so good…
Customer removes $65 from cart. Tier 3 removed. Tier 2 not applied. Cart forced update (change shipping selector, etc). Tier 2 discount applied.
I’m seeing that only 1 action happens per cart update. Either it automatically adds the matching price range coupon or it removes a coupon but then requires another cart update to activate the coupon that matches the applicable price range.