This is definitely some odd behavior to be experiencing. There should not be anything in PowerStore that will selectively delete options from one day to the next.
A good test of this problem might be to add in the options like you are doing, then afterwards export the db as a backup. Then the next day when you login and see that the options are missing export the db at that point as well.
If you can post back with these two versions of the db this might give us a better idea of where to start looking for problems. Are you the only user of this admin area? Do you have any backup or syncing scripts that run on a daily basis?