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