Thank you for your question
My name is Clare
I shall do my best to help you but i need some further information first.
Could you explain exactly what has happened to provoke the application?
You have not lost any rights at all.
The only benefit your ex gets are
1. If you fail to return them after any period that it has been agreed they should spend with you then she can ask the police for assistance in recovering them
2. She can take them out of the UK for up to 28 days without your agreement (provided it does not interfere with contact)
I hope that this is of assistance - please ask if you need further details