Redis data being wiped out

I have a single redis server running in a docker container on my server.

I use the defaults for everything.

I populate it with some key values and call save.

Every day though, it gets wiped out. The logs look like so

 Before turning into a replica, using my own master parameters to synthesize a cached master: I may be able to synchronize with the new master with just a partial transfer.
 REPLICAOF 46.12.32.122:8886 enabled (user request from 'id=66 addr=82.112.107.100:34932 fd=14 name= age=0 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=46 qbuf-free=32722 obl=0 oll=0 omem=0 events=r cmd=slaveof user=default')
 Connecting to MASTER 46.12.32.122:8886
 MASTER <-> REPLICA sync started
 Non blocking connect for SYNC fired the event.
 Master replied to PING, replication can continue...
 Trying a partial resynchronization (request 05e89fe9fc1391690bdeed6ce650cfd4eb511553:1).
 Full resync from master: ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ:1
 Discarding previously cached master state.
 MASTER <-> REPLICA sync: receiving 55664 bytes from master to disk
 MASTER <-> REPLICA sync: Flushing old data
 MASTER <-> REPLICA sync: Loading DB in memory
 Wrong signature trying to load DB from file
 Failed trying to load the MASTER synchronization DB from disk
 Connecting to MASTER 46.12.32.122:8886
 MASTER <-> REPLICA sync started
 Non blocking connect for SYNC fired the event.
 Error reply to PING from master: '-Reading from master: Operation now in progress'
 Connecting to MASTER 46.12.32.122:8886
 MASTER <-> REPLICA sync started
 Non blocking connect for SYNC fired the event.
 Error reply to PING from master: '-Reading from master: Connection reset by peer'
 Connecting to MASTER 46.12.32.122:8886
 MASTER <-> REPLICA sync started
 Non blocking connect for SYNC fired the event.
 Error reply to PING from master: '-Reading from master: Connection reset by peer'
 Connecting to MASTER 46.12.32.122:8886
 MASTER <-> REPLICA sync started
 Non blocking connect for SYNC fired the event.
 Error reply to PING from master: '-Reading from master: Connection reset by peer'
 Connecting to MASTER 46.12.32.122:8886
 MASTER <-> REPLICA sync started
 Non blocking connect for SYNC fired the event.
 Error reply to PING from master: '-Reading from master: Operation now in progress'
 Connecting to MASTER 46.12.32.122:8886
 MASTER <-> REPLICA sync started
 Non blocking connect for SYNC fired the event.
 Error reply to PING from master: '-Reading from master: Connection reset by peer'
 Module ./red2.so failed to load: It does not have execute permissions.
 Setting secondary replication ID to 05e89fe9fc1391690bdeed6ce650cfd4eb511553, valid up to offset: 1. New replication ID is e6492767f48bc9203cda8c66520d29701364391d
 MASTER MODE enabled (user request from 'id=66 addr=82.112.107.100:34932 fd=14 name= age=7 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=34 qbuf-free=32734 obl=0 oll=0 omem=0 events=r cmd=slaveof user=default')

I suppose this is related to the issue, but I am extremely confused as to why this happens (both the actual replication and the failure)