I have noticed that esc calibration does not work well with bluejay. It does not do the esc sounds that blheli did. After fiddeling it is possible to somehow do it, but it is never possible to replicate.
Im just wondering is it just me, or is there something else behind it
Yes, but for some reason after flashing the motors there is no signal going to the motors. Only after doing the esc calibration and waiting for like 2-3 minutes the esc will get the signal
Yea, as @prsh8ya suggests this is usually a configuration error problem. There are a few parameters to set correctly. Use the Bdshot version of firmware for your Flight Controller and configure for Bdshot.