Leap 15.4 installation problem as shown in the attachement pictures

This step is for the disk partition, but it fed me with errors. I do not know how to resolve it.
I have tried to re-download the iso, but it still happened. Leap15.3 doesn’t has this problem.

Pragmatic answer - install Leap 15.3 and update.

but why it had happed on my pc? is it a bug?

Probably something unexpected in disk partitions layout. Show full output of

fdisk -l
lsblk -f

ok, the problem is my bootable flashdisk , i write another one with rufus, then it is working smoothly.