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Strange shipping rates scenarios

Hello

We're integrated using the Magento extension, and does anyone has any idea how rates are calculated? There are certain strange scenarios.

  1. 2x of SKU1234, there are rates.
  2. 3x of SKU1234, there are no rates.
  3. 10x of SKU1234, there are no rates.
  4. 11x and above of SKU1234, there are rates.

Additional scenario
5. 10x of SKU1234 and 1x of SKU9876, there are rates.

Option 1, 4 and 5 rates are showing same providers (Ninjavan) with similar pricing so it's not a different sets of methods or providers issue.

What happened to scenarios 2 and 3, and all the quantity in between did not provide any rates as well.

We are currently using Production environment (https://api.easyship.com/rate/v1/magento), and the requests that I have dumped out have no difference apart from a bigger array 3 vs 11 items.

Hope to understand more as our client is equally puzzled and need some answers on this strange behaviour.