I have a similar problem and can’t find anything.
I have a Tor running on a router with OpenWrt and I don’t have a hidden service or bridge only a SocksPort configured. I also don’t have a webserver on the 443 port but my logs filled with repeating messages like this:
[debug] conn_write_callback(): socket 10 wants to write.
[debug] flush_chunk_tls(): flushed 514 bytes, 0 remain.
[debug] connection_handle_write_impl(): After TLS write of 514: 0 read, 536 written
[debug] circuit_remove_handled_ports(): Port 443 is already being handled; removing.
[debug] circuit_remove_handled_ports(): Port 443 is already being handled; removing.
[debug] circuit_remove_handled_ports(): Port 443 is already being handled; removing.
[info] channelpadding_send_padding_cell_for_callback(): Sending netflow keepalive on 2 to [scrubbed] ([scrubbed]) after 8441 ms. Delta 0ms