Session Browser is grouped by 'User'. Highlight a specific User without drilling into each session. On checking the 'Long Ops' tab, there appears to be more Long Op sessions displayed than there should be.
WORKAROUND
Group by 'OS User' instead of 'User'. Drill down to each session and click the 'Long Ops' tab.
STATUS
This issue is fixed in Toad for Oracle 12.0. This version can be downloaded from the downloads section of our website, which you can access by clicking here.