Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f1/STM32F100/AFIO/EXTICR3#0x0
External interrupt configuration register 3 (AFIO_EXTICR3)
EXTI8 configuration
EXTI9 configuration
EXTI10 configuration
EXTI11 configuration
https://github.com/modm-io/cmsis-svd-stm32