Is this a continuation of another manga or is the chapter out of place?

it's short stories of another manga.

sorry i accidentally clicked post.
It's from light novel Tearmon Empire which also adapted to manga. The manga for the main story is not this one. you can just search it in this site

Ahhh alr thank you! I was suspicious cuz the original manga wasnt linked on the page where it normally would be under the author's previous works

you're right the info isn't updated properly