Are you sure? lightning doesn't allow you to pay a different amount than the invoice.
If you don't have a lightning channel 10k sats will be deducted to create the channel, maybe that's what happened
If anyone is using nostr:npub1mutnyacc9uc4t5mmxvpprwsauj5p2qxq95v4a9j0jxl8wnkfvuyque23vg wallet a lot keep an eye on what it's telling you and the actual balance. Somebody paid an invoice (regular old BOL11 with a defined request amount, not a zero) to me with it and it overpaid by almost 13000 sats and didn't report that to the wallet owner. Not saying don't use it just keep a close eye on it.
Discussion
You can over pay up to 2X