[Bug] Test-runner shows double the amount of tests before it finishes running

[yannbf]

Describe the bug

When running the test-runner in a project that has, let's say, 10 tests, it shows 20 tests in the counter as the tests are running, and only after the tests are done, then the counter goes back to 10.

Steps to reproduce the behavior

1. Run yarn test-storybook
2. Watch the counter go higher than it should

Expected behavior

The counter should reflect the correct amount of tests.