Someone is using multiple accounts to get votes on his own suggestions as well as downvoting others. All the accounts are from Finland, and some of them were created around the same time. The usernames are:
aleksimalkavaara (https://www.mycast.io/profiles/31832/username/aleksimalkavaara), jannehela (https://www.mycast.io/profiles/36896/username/jannehela), maxmaxie (https://www.mycast.io/profiles/36882/username/maxmaxie), jannemeemi (https://www.mycast.io/profiles/36944/username/jannemeemi), hanskatasku (https://www.mycast.io/profiles/37066/username/hanskatasku)