Stopping mysql but port is still not free

Build Environment Databases
1 
for db  Cannot start service db: failed to create endpoint connectedcars_db_1 on network connectedcars_default: Error starting userland proxy: listen tcp 0.0.0.0:3306: bind: address already in use

But I have already stopped it

sudo service mysql stop
2

Is this a public repo? If not, can you DM me the build URL?