I have always had this issue. I am using the HQ Raspberry Pi camera.
In the Indi Control Pane for the RPI Camera i enter 10seconds for exposure and the count down time gets to about 7seconds and it fast forwards to zero. So really it took about a 3 second exposure from my point of view.
I have to take another exposure of 10seconds and it counts down the exposure right.
Any ideas? Or is this bug that needs fixed?