Hi Knio,
From what I know these phasers they have a heavy return spring which sets phase to zero when there is no oil pressure. Can you move the 2 parts of the phaser back and fourth easily on the original one? Compare it to new one. It maybe stuck in one position.
Why this has happen is another question. Maybe related to low oil level.
Did you also compare length of the old timing chain vs new one?
Also, there are 2 solenoid valve on the front cover. Check these are working and not stuck open.
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