My own grin explorer does not have genesis block data

@noobvie Just a guess, you are probably not connected to an Archive node since there are few around. Still on my to do list to run one of my own.
If you are not connected to another archive node, but only to other nodes, you cannot sync all the older blocks including the genesis block since they are not available.

You should checkour https://grinnode.live/grinnode.live, they have some publicly available archive nodes which you can add to your peers list to sync the full blockchain with history:
https://Grinnode.live Public GRIN API and sync service
If that does not work you can contact @mcm-mike, but first try to get it to work on your own.