Is it just me or is the certificate showing missmatch for others too?
This server could not prove that it is cardano-explorer.cardano-testnet.iohkdev.io ; its security certificate is from explorer.cardano-testnet.iohkdev.io .
aaah, its an incorrect link on the success page post facet usage.
The success link to look at the transaction points to an old cardano explorer link.