Execution count is added each time the test is run. The calculation formula is as follows:
[Scenario] × Execution environment (IE, chrome, etc.) × Number of [Data]
This number matches the number of [Results] (= sum of green and red numbers if looking at the results list)
Rest assured that tests that have been [Pending] or [Canceled] are not counted in the number of executions.
Please refer to this page for [Data].