From the Test Cases tab, in a User Story, the tab shows a number that does not match the number of listed Test Cases on the screen. For example, in the screenshot below, the tab shows 3 Test Cases, but there are 4 Test Cases listed.
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This user story has one or more child stories that have Test Cases associated to them and the test case tab only shows the total number of test cases at the parent level.
The Test Cases tab will display the count of Test Cases that are associated to that specific User Story. However, the list of Test Cases shows all Test Cases that rollup to that User Story including its children’s Test Cases in order to ensure that a user has a full view of any relevant Test Cases.
Verify this is the case!
From the User Story: