getSignaturesForAddress not fetching some signatures

Token contract: 6ogzHhzdrQr9Pgv6hZ2MNze7UrzBMAFyBBWUYp1Fhitx

I am trying to fetch history of transfers for this token.

My request:

{"jsonrpc": "2.0","id": 1,"method": "getSignaturesForAddress","params": ["6ogzHhzdrQr9Pgv6hZ2MNze7UrzBMAFyBBWUYp1Fhitx",        {"before":"3LuEcMhbSAgdJJrNRG97GpfQH2wWLo3PqfXmrmvz6NnKyBMboWwpjjQeb26u6wjNQfHmrnhxgyd15cDTmwVZdFQu","commitment":"confirmed"        }    ]}

If we filter out signatures with errors, here are 3 closest signatures that we receive in response:

2B7YYTvMJXSeqJCfmFTDRV2cDNH9HfyHApwdNCYqzfwgAE7fiao51gKA8CXYNNe3QECnEW9fJFzFCLL12iqHzhWg3ma9TbKhDoZkYi7oVWEj7Ku8MGCpWETJtCaUWWht92njJmZtnWG6PZwM8QzaTBUPiHnTxyvb5ujZWEnD6ns2nbd63AbVBYo3cWvouWTLM6kr7JLgYJfpYzcpKp8fAWNgdnxudboPGRU8tgKBMXDDjuCMVSVQxzsBQTaT527wqihPHWDP

However, if we check transfer history on something like solscan.io, we will see that there is one signature that is missing:26kzWS1NBWPYLGEZELEXAMHKGzTQ6LSHKkBHNhyHGKibKSWcGe5LZ2QYgrUEYpwzL8CB5reKA7FYqnyxJui13vYT

Please help me figure out why this signature is missing when I am fetching data using RPC API.