Sort ascending and descending of variables does not work as expected

Hello, colleagues.

I'm working with several term templates which contain many variables that will be captured manually by the key user. I am numbering these variables at the beginning of the name so that I can use the option to sort the variables in ascending order and fill them in logical order.

However, when I click on the option to sort the pending variables in ascending order, they are not displayed in the expected order, for example:

In the image you can see the following order:

A.

AA.

AB.

AC.

AX.

AY.

AZ.

And continues with:

B.

C.

D.

The correct ascending sort should be: