
Bell's Skill Conflict
I remembered that Bell's LF is linked to Ais. Because of this, his stats increase. However, Vanadis Tevere increases stats and regeneration by default. And this skill is linked to Syr, not Ais. This means the two skills can conflict. It's possible that when Vanadis Tevere is activated, the stat point increase becomes the same as for a regular adventurer. Bell also has the skill "Ox Slayer." This skill is also not linked to Ais; it's linked to Asterios and only affects Ox-type monsters. This means there's some kind of penalty when increasing stats in these cases, similar to when using Haruhime's level-up. For example, when fighting Ais, neither of these skills can activate, and without them, Bell can't reach Ais's pover. LF considers using these skills cheating. If so, that would explain a lot.