Sorting from smallest to biggest problem

Welcome to the forum.

The issue is that Excel sees these entries as TEXT and will therefore sort them alphabetically. You would need to change them to this to make it work:

1070/105
1070/011
1070/003
1070/205
1070/206
1070/207
1070/120
1070/050
1070/002
1070/004

There are instructions at the top of the page explaining how to attach your sample workbook (yellow banner: HOW TO ATTACH YOUR SAMPLE WORKBOOK). Screenshots are of little practical use as we cannot manipulate them.

A good sample workbook has just 10-20 rows of representative data that has been desensitised. The sample layout accurately matches that of your real data. It also has expected results mocked up, worked examples where required, relevant cells highlighted and a few explanatory notes.