EfekanKksal You only have 6 tags total, and only one is primary. Flarum has at least 8 primary tags. So you're seeing ALL primary tags, plus 3 secondary tags.
Make more primary tags if you want to see more. You can do this by clicking and dragging your tags up into the Primary area, and dropping them once you see a dotted outline of the tag.
The header links are from this extension: https://discuss.flarum.org/d/2230-links/
We need more information for the mail activation token problem. Did you get your mail driver to work? Is it sending emails?
What is the URL provided that causes an invalid confirmation token?