Hey, thanks for flagging this. I think what may be happening is that after the merge at the end of the retention chain, the UI might be picking up the full VM size (2.17 TB) instead of the actual KEY file size on disk (9.1 GB).
If you can confirm the key file is genuinely 9.1 GB on your storage, that would point to a display bug rather than a data issue.
Could you please check, and if so, it might be worth opening an issue on the XO GitHub with the numbers? I'm not entirely sure of the exact mechanism here, so @Team-XO-Backend would know better than me.