Someone claimed over my glass dome that I had clearly built in and thought I had claimed too?

[B_ok]

A user with the name Rikmass claimed over a large glass dome filled with sand that I had built. I have been inactive for some time but now coming back, I went to check on the space and it was claimed. I swear that I had claimed the dome, and am very confused. I would like this claim to be unclaimed so I may have my dome back.

[PapaMaoDONG]

Sorry on the late reply B_ok, if you wish to remove him from your glass dome, please fill in the required.