Re: Strange decreasing value of pg_last_wal_receive_lsn()

Hello

Yes, this is expected. Walreceiver always start streaming from beginning of the wal segment.
./src/backend/replication/walreceiverfuncs.c in RequestXLogStreaming:

     * We always start at the beginning of the segment. That prevents a broken
     * segment (i.e., with no records in the first half of a segment) from
     * being created by XLOG streaming, which might cause trouble later on if
     * the segment is e.g archived.

regards, Sergei