Welcome to the forum!
Hhmm, I see you're using version 0.91. I actually still have that version, so I can test and find out if I can reproduce that. But even if I can, developers will not be interested in a bug report, because the current version of Inkscape is 0.92.3.
Would you like to try upgrading, and find out if the problem still happens there? Or do you have some reason to be using 0.91?
I'll test, and I'll be right back. (Oh, and the tutorial itself has probably been upgraded too.)