Setting GPIOC->ODR[13] = 1 is not tuning up the user LED, rather it is turned up by leaving it to default (i.e. 0). [STM32F103C8T6 (blue pill)]

Question

I have just started learning bare metal embedded development using CMSIS Core framework. I do not understand why the user LED is not turning on by setting the ODR[13] to 1 b