Well, English does. Not my native language.

Yes, my point exactly. No “onety-one”, because “eleven”.

Same with other languages.

But “thirteen”, “fourteen” etc, you think are as regular as “twenty one”, “thirty three” “forty five”?

It is base-10 all the way through, but I’m just pointing out that probably at one point in history, even other languages, for some reason, counted 1-20 differently than 20+ numbers and they sort of stuck.