You can find the solution in the end of this post.
My Tor relay is working as an Exit, but it is configured with ExitPolicy reject *:*
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EDIT:
Hey I wanted to close that issue. The main problem was that I confused the EXIT of the internal circuit with the EXIT of the Tor network. 2 tickets exist to clarify that UX problem in ARM. 6430 and 12956.
I think for non-general-purpose circuits, we should call that third hop something else. I'm open to suggestions -- one option would be to just call the last hop on a non-exit circuit "Middle" also. Another option would be to call it "Internal".
There exist one more stackexchange question too.
In conclusion, what I have seen is that TOR made internal circuits and called me the EXIT of them. That is not really a problem because I am not an EXIT of the Tor network itself.