Can you clarify if there is (was) any data on the logical drive when you expanded the disk capacity ?
Since the event log shows below and I see no events related to a rebuild of any of the existing disks to the larger ones:

If no data needs to be saved then you should be able to clear the pfa state of the disks in the utility.
This can also be done in cli:
- open terminal
- type: promiseutilpro
- type: phydrv -a clear -t pfa -p 1
- type: phydrv -a clear -t pfa -p 2
- type: phydrv -a clear -t pfa -p 3
- type: phydrv -a clear -t pfa -p 4
- type: exit
Now you can re-create the disk array and logical drive in the utility dashboard.