Several times request to load plugins when sending one request

That might well be, but that’s alright. There might be redirects happening, and those will result in multiple requests.
The WordPress-Cron System relies on AJAX-requests, those will also show up in the log.
If you load any resources (images, scripts, stylesheets) that do not exist, WordPress will be loaded and handle the 404, resulting in more requests (and log entries).

Unless you’re seeing a large number of requests per page view, it’s probably fine. If you do, use your browser’s developer tools to see what requests it is sending and why.

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