Why do my Digimon have different max levels?

Hey, second time ever playing a digimon game (first was Cybersleuth) and I couldn't really find the answer to that anywhere.

I'm fairly early on in the game, >!I just met up with Minervamon in the "past"!<, and I noticed despite being at the same evolution "level", some of my Digimons have a lower maximum level.

Most of them are around lvl 20-30, but my Renamon and Huckmon can only go up to lvl 11, is there a way to change this?