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Yes !

If the tag is in the body of the post, it will automatically be a tag for the post.

I think that's stupid.
Okay, what to do, I know now...

Is that only for that introduceyourself tag or also other tags?
Thanks @felixxx

All tags in the body end up in the 'tags' field.
I don't think that's ideal ...

Okay, good to know.
I tried to remove the tag but it doesn't work,
It used to be possible to remove tag 2-3-4-5
Anyway, thanks for explaining!!

You can not remove it, because you mention it in the post.

Got it!!
Now it's gone...
Thanks you teacher :-)