disk cloning - partclone.btrfs thousands of correctable csum errors

I just cloned a btrfs file system from one disk to another using partclone.btrfs --dev-to-dev. Afterwards, I mounted the cloned file system and started a scrub to see if everything is in order. After a while I checked the status and was shocked to see hundreds of thousands of correctable csum errors. Should I be worried? Since they are correctable errors, I guess it's OK, but still. Is this an expected result of the cloning? I'm using Oracle Linux 6, i.e. kernel 3.8.13.

Thanks for any insight in advance.

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