please, read the pinned message.

you can see 4 first line here. 3 nodes off-line in waiting list (not validating at current epoch) and another one eligible (validating at current epoch) , perhaps currently syncing and will be seen online in few minutes. https://explorer.elrond.com/nodes?type=validator&online=false

no some nodes are in waiting list (not eligible in current Epoch) and they can be in maintenance.

not the good topic here.