In Bootstrap 2.2.2 there seems to be a bug in bootstrap.tooltip.js (as well as the .min version) in the toggle-function. This is fixed in Bootstrap 2.3.0. I suggest you update Bootstrap to 2.3.0.
This is what the first line in the toggle-function should look like: var self = e ? $(e.currentTarget)this.type.data(this.type) : this
Again, 2.3.0 fixes this so updating to that version should be enough to solve this!