Problem with switching pins

[Embedded_dev1]

Hi to all!
I have the following question: why do the relays in the circuit start switching when I connect the STM32F1 microcontroller to the computer through the programmer?
And similar happens when I initialize RCC. As if all the contacts are being checked and the relays are starting to switch.
What could be the problem?
I will be grateful for the answer!

[AScha.3]

1. show your circuit - i cannot see it clear in my blue glass ball...

[Imen.D]

Hello @Embedded_dev1,

Check the configuration and reset state of the pins.

 

[Embedded_dev1]

Ok, thank you!

[Millertom3862]

The relays switching during STM32F1 microcontroller connection may result from default GPIO states during initialization. Ensure proper pull-up/down resistors to prevent undefined states. When initializing RCC, check for inadvertent GPIO state changes and add delays or debouncing if necessary to stabilize signals during startup.

[Embedded_dev1]

Thanks for the answer!