It's possible to sort table content by clicking columns header.
If you click it, down/up arrow shows there.

The problem is that the same direction oriented arrow means different ordering in different columns.

Columns ordering when DOWN arrow displayed:
(columns with wrong ordering are bold)

CaseId: Z -> A

Summary: Z -> A

Product/Version: Z -> A (but values in this column are ordered only by Product, not Version)

Status: A -> Z

Severity: A -> Z

Owner: Z -> A

Opened: Latest - > Oldest
Updated: Latest -> Oldest