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There could be several reasons why the Android RadioButtons within a nested RecyclerView are not allowing for single selection and unchecking:

1. Incorrect implementation: The implementation of the RadioButtons within the nested RecyclerView may be incorrect or incomplete, causing them to function incorrectly. This could be due to the improper use of adapters, view holders, or listeners.

2. Data inconsistency: If the data being passed to the RadioButtons is inconsistent or not properly updated, it may cause issues with the selection and unchecking. This could be due to a lack of synchronization between the data and UI or data not being properly initialized.

3. View recycling: When views are recycled in the RecyclerView, the state of the RadioButtons may not be properly preserved. This can cause issues with the selection and unchecking of the RadioButtons.

4. Interference from other views: There may be other views or elements within the RecyclerView that are interfering with the selection and unchecking of the RadioButtons. This could be due to overlapping click listeners or conflicting layout constraints.

To resolve these issues, it is important to carefully review and debug the implementation of the RadioButtons within the Nested RecyclerView, taking into account all the possible factors that may be affecting their functionality.