Odd grippers are useful, even when they are uneven.
These few grippers are on sale because the handles were mounted unevenly. One lever is longer than the other. While aesthetically jarring because the bevels don't meet when closed, there is a silver lining. These perfectly functional grippers are kind of like two grippers in one. If you put the longer lever in your fingers, it will feel slightly easier and vice-versa. The gripper essentially has two different ratings.
For these pre-rated options, the rating is the average of the two numbers.
In general, these grippers are only uneven enough that the ratings are roughly 2-4 pounds apart. These are brand new grippers that come with the packaging.