Why is the first IP address in my relay circuit always the same?

That is normal Tor behavior. The first relay in your circuit is called an "entry guard" or "guard". It is a fast and stable relay that remains the first one in your circuit for 2-3 months in order to protect against a known anonymity-breaking attack. The rest of your circuit changes with every new website you visit, and all together these relays provide the full privacy protections of Tor. For more information on how guard relays work, see this blog post and paper on entry guards.

https://support.torproject.org/tbb/tbb-2/
And I have already managed to change the "Entry guard" several times: from United Kingdom to Germany and to Ukraine, to France. But the lamers can not do it and do not even know about the new feature of The Tor Project

I continue the experiments...

I revealed that Tor begins to ignore directive ExcludeExitNodes in torrc file.
Moreover, the application when starting, removes this directive the configuration file.

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I solved this problem. Simply and reliably