Henchmen do not take xp from the main character. They are just there to help you, and they level up when you do. They do not have a separate xp pool.
In fact, they may indirectly increase your xp. The game rates your parties ability to defeat monsters, and sends more or less at you. With just a solo character, you will see fewer encounters, therefore, less xp. This won't be a big deal in the long run. Once you get to level 15 or 16, the games no longer very challenging. However, early on this can matter.
The other possibility is that now you know the game, so you didn't spend as much time wandering into random doorways and fighting extra bad guys. There's a lot of xp to be found in random houses and such in the various districts.
Another way to get differing amounts of xp is whether or not you kill the people who surrender. The half-orc in the prison surrenders. If kill him, he's worth 350 xp. There's also the sorceror in Blacklake.
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