hi,

What has the interrupt enable bit to do with this??
It just disables its service routine to be called. It does not disable interrupt event detection. When you enable RTC interrupt inside ISR of ADC interrupt, then ISR of RTC will be executed again when its interrupt event come. What does confuce you?
Just stop to play with interrupts and their control bits now, otherwise you have a chance to lost control over it all in the future.

Regards,
Oleg