1. I have created a new test cycle and added a old test case.
2. Now, the old test case has two test cycles mapped.
3. I opened the test case and clicked on both the test cases link in test executions area.
4. Both the links redirecting to the newly created test cycle page.
You can raise a support ticket here: https://support.getzephyr.com/hc/en-us
and their support guy will get back to you.