Merivälja Südamekodu:

Now Merivälja Südamekodu exists in two instances, this is incorrect. If you think that the area is incorrect, remove it. Otherwise remove the node. I think there was car repair service on the same grounds, but if they are accessible to elderly, I think it's ok to leave the area and delete the new node.

Pirita:

You've deleted the building for some reason. You can restore it by selecting the area and then either clicking on "area" at the top left and selecting a "building" there.

Or go the tags section in the bottom left and add building=yes and remove area=yes.