Reply To: UV unwrap not so good.
The Plank you are showing here has a non-uniform Scale:
CTRL+A > Apply Scale:
Then Unwrap again:
As for the bottom Planks: this is not supposed to be there:
But that’s a plank on the backside; the ones on the front side look okay now. You can simply mirror them on the Y-axis to get the back. No one is ever going to see the back and front at the same time, so they won’t notice the mirroring 😉