we have found a strange behavior at checkout with carrier shipping rates. When showing shipping carrier prices for a different market and currency, where the market rounding is enabled, it seems that the rounding is not the expected one.
Example: I have configured a market for France in EUR and with rounding:
This does look like unexpected behaviour, as the rounding should be applied with shipping rates as well as product prices, per our Help Center documentation.
I’ve also not been able to replicate this behaviour on my own test store, it is rounding the shipping rates as expected.
We will need to look into this further with specific examples of checkouts returning this behaviour. If you can please replicate the issue again, copy the full Checkout URL, and reach out to our Shopify Support Team via the Shopify Help Center while logged into a Partner or Merchant account with permissions to view orders on the store, and we can definitely help look into this in further detail.