You may see multiple Life Cycle report in GA4：
When you make adjustments to the report in TOPICS for the first time, and then save it to the current report, a new Life Cycle Collections will be generated.
If you modify the report in different TOPICS and save it, there will be more Life Cycles Collectios.
But not always, just for some users, looks like a bug.
Delete the redundant Life Cycle Collections in the Library, the Library is at the bottom of the Report: