It appears the board/tile joints aren’t staggered so you will be faced with them slipping. You can try and get them back together but I would expect it to happen again.
Assuming you cannot get to the end is the boards to tap them back together ?
If you can get someone to stand on main floor area and then kick loose board back to position wearing a rubber soled shoe it should snap back in, if it happens a second time a drop of glue down the seam before kicking back . If the edge is too damaged to hold then panel pin thru panel at skirting edge will hold it .
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