Deleted documents reappearing in database

Couchbase Server Community Edition 6.5.1 build 6299
Sync gateway 2.7.3
Couchbase Lite Android 2.8.1

We are experiencing a problem where deleted documents are reappearing on our Couchbase server.

Here is the process of what is happening:

1. Document is created on CBL with a TTL of 15 days and synced to sync gateway.
2. Document is updated on CBL and synced to sync gateway.
3. Document is deleted from the Couchbase Server bucket with a DELETE N1QL query.
4. After the document is deleted from the bucket it gets randomly added again within a few days.
5. Only documents that are still on the devices i.e. not older than TTL of 15 days, are added back to the bucket.

We tried increasing the Metadata Purge Interval to more than 15 days but this did not resolve the problem.

Does anybody have any suggestions or possibly know what could be the problem here?

Thanks in advance!

PS: Here is our Sync Gateway config with the sync function:

    "log": [
        "*"
    ],
    "adminInterface": "0.0.0.0:4985",
    "interface": "0.0.0.0:4984",
    "databases": {
        "prod": {
            "server": "http://localhost:8091",
            "bucket": "prod_bukcet",
            "username": "sync_gateway",
            "password": "XXX",
            "enable_shared_bucket_access": true,
            "import_docs": "continuous",
            "use_views": true,
            "users": {
                "user_X": {
                    "password": "XXX",
                    "admin_channels": ["*"],
                    "disabled": false
                }
            },
            "sync":`
                function sync(doc, oldDoc) {
                    /* sanity check */
                    // check if document was removed from server or via SDK
                    // In this case, just return
                    if (isRemoved()) {
                        return;
                    }
                    //Only sync down documents that are created on the server
                    if (doc.deviceDoc == true) {
                        channel("server");
                    } else {
                        if (doc.siteId) {
                            channel(doc.siteId);
                        } else {
                            channel("devices");
                        }
                    }
                    // This is when document is removed via SDK or directly on server
                    function isRemoved() {
                        return (isDelete() && oldDoc == null);
                    }
                    function isDelete() {
                        return (doc._deleted == true);
                    }
                }`,
        }
    }
}```

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