In some cases the (displayed) server address will not match the highlighted server. Thinking that the correct server is already chosen, I press [Connect] to join. But in the end I will hop on a very different server.
The server address should always match the highlighted server.
I will amend the specific steps to reproduce when I am back at home, sorry for the inconvenience.
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Teeworlds: 0.7.1
OS: Linux Mint 19.1, Cinnamon Edition