Can you reproduce it in Online Oracle Apex?
Than i can check it for you. Or you can use Region Display Selector. With Region Display Selector , it can works Without Issues
Thanks a lot Alli for your quick answer.
Can we make it the other way round... I mean .... do you have a working sample in any web or Online Oracle Apex?
how exactly are your detail regions implemented? You'll probably have to use some variation to this Let's Wreck This Together...with Oracle Application Express!: Preserving checked checkboxes in a report (more recent variation is here Re: Interactive Report Check box looses check on record page navigation ), e.g. store your data temporarily to apex_collections and load them back from the collection when needed.
Please, could you specify your requirements in more detail? A sample on apex.oracle.com would be actually the best thing you could do to get your problem solved.