Master Seed from Mycellium does not concord with address Mycellium app generated for me
Used this site https://iancoleman.io/bip39/ to generate the derived addresses from my master seed

Please do not enter seed on any website. It's only safe if you run it locally on your machine from https://github.com/iancoleman/bip39

Any chance to recover my lost coins ?

I would suggest restoring wallet in Electrum. You can follow the steps mentioned in this answer: https://bitcoin.stackexchange.com/a/99441/
Basic things to keep in mind: Either system used for wallet is offline or not affected with malwares, download from original source, verify it and never share your seed with anyone else.
Also for gap limit refer to: https://electrum.readthedocs.io/en/latest/faq.html#gap-limit and https://bitcoin.stackexchange.com/a/98919/