1. since, u are using dd, the UUID for sda4 & sda5 remain unchanged.
2. /etc/fstab get confused about that.
3. try as #5 as read only fs to read the files.
change the uuid for sda4 (the restore iso testing partition)
add a new entry in /etc/fstab, say,
UUID=xxxxx ext4 ....
/dev/sda4 ext4 ..........