Something seems mismatched

Then is it a "problem" from the source material, directly? Or things will be unfolded later? Or is it my dumb brain that can't comprehend the story?

I will repeat what I've written elsewhere. The problem is the terrible pacing and skipping of an entire volume (volume 0) which was important before going into this arc.

- The first three chapters had world building and introduced 3 important characters and their skills (Keinzell, Ato and Rosen) -> you only see the missing two in the opening
- Chapter 4-5 is Keinzell's backstory -> anime only viewers have little idea what/who the guy even is

Volume 0 was needed to tell us "who" our MC is, "what" his motivations are and "why" we as the audience should care.

All this is missing in the anime. So far they adapted 4 chapters in EP1 and 4 chapters in EP2 (the entirety of volume 1), which results in rushing certain scenes, making emotional impactful scenes less relevant and adding time to useless enemy monologues. The annyoing evil dude talked the same nonsense in the manga, but he had less lines, which made him less cringe in the manga. Peepi also managed to defeat a random soldier, which was cut in the anime. A lot of gore was skipped and all sexual content is missing.

What also makes no sense now is what Wied said 5 minutes into ep2: "He (Keinzell) will be fine, at least if he is who I think he is." The anime audience has no context to that line. Keinzell build a certain reputation for himself in volume 0. Without going into spoilers, he got nicknamed "the hero of the borderlands". Wied heard of this new hero, so he suspects Keinzell must be the one. So Wied's line in the anime is completely useless and could have been cut as well since it's only confusing without volume 0 content.

That's why I think the pacing is horrible and the adaption is subpar. The manga deserved better. I bought all 23 volumes and never regretted buying them.