Libertarians really are. They see Anarchism as a rival to their beliefs, and need to stop people from going there instead of supporting them. It was part of the reason why they hijacked the word libertarian in the first place.
They also try to claim individualist anarchists such as Max Stirner (friend of the young Marx and Engels), Benjamin Tucker and Lysander Spooner, and conveniently ignore all the anti-capitalist ideas that they wrote about. They viewed capitalism as a form of collectivism, which is rejected by modern libertarian capitalists but they need to somehow claim a history that they don’t have.
It is a very real problem, and it is basically the same problem as saying that Democrats are Marxists (I’m sure a tiny minority are Marxist, but most Marxists are members of minor parties) and that Republicans are conservatives (they were about 50 years ago, but have since moved into reactionaryism and more recently fascism)
I’ll see what I can do.