Hello!
In my map I got three Attribute Bonus skills on a hero, each provide him with a different attribute. For the strength skill it works as it should, but for the agility and intelligence skills it doesn't. They get removed when I learn lvl 1 (I get them in my spell menu, but I can't upgrade them into higher lvls. And no, they don't have only 1 lvl. Another thing that might be of interest is that the hero doesn't originally have these spells, but they are added by Engineering Upgrade.
In my map I got three Attribute Bonus skills on a hero, each provide him with a different attribute. For the strength skill it works as it should, but for the agility and intelligence skills it doesn't. They get removed when I learn lvl 1 (I get them in my spell menu, but I can't upgrade them into higher lvls. And no, they don't have only 1 lvl. Another thing that might be of interest is that the hero doesn't originally have these spells, but they are added by Engineering Upgrade.