Springs or damper issue

On my set of coilover, I use to set the damper stiff.

Now that I soften them up and find more grip.

the first day I soften them, it feel a bit floating or bounce.

After a few run on that day, I parked the car for a week.



Now it's the second time I drive the car, the damper seems to have stiffen up abit. But I have not touch the setup.



no idea why