Sorting points

Hi there,

This plugin works great and does what we need super easy. The only problem is that when I click on the Subtotal to sort the points, it’s not sorting in the correct way. For example, sorting from the highest point to the lowest points is like this:
97,96,954,95,94,88,87,865,83

but it should be like this:

954,865,97,96,95,94,88,87,83

and from the lowest to highest is like this:

114,118,119,12,124,128,154,16,162,17

which is expected to be like this:

12,16,17,114,118,119,124,128,154,162

Any suggestion to fix this small issue?

Thanks,
Majid