The code for kicking with boots has been redone. Boots are now treated as a weapon, which gives us builders the ability to make highly custom boot damage. Before, the extra damage from wearing a boot only depended on its enchantment bonus, so it was very generic.

All existing boots have been updated. New damage had to be assigned to old boots, so hopefully they will still kick for the same amount. Any old boots in game will lost their effectiveness (that's what happened to you, Sulik). If you like your boots, speak with a watcher and I will replace them with the newer version.