Need Help with Catch up Depreciation calculation!

We are unable to understand how is Oracle calculating the "Adjustment Amount" when are upload an Asset with DPIS in past.

the Depreciation Calendar is monthly , 12 months JAN-DEC

Prorate Calendar is DAILY (365 days)

Prorate Convention at the Asset Category level is "END OF MON"

Mthod STL

Life 20 Yrs 0 month

Date in service - 16-MAR-2018

Prorate DAte 31-MAR-2018

Cost 619.5

Uploaded this asset in MAY-18 and ran depreciation.

DEpreciation Amount = 2.58    (this makes sense = 619.5/240)

Adjustment Amount  = 2.77  (does NOT make sense....how is this calculated??. Shouldn't this simply be 2.58 * 2 = 5.16 )

Total Amount = 5.35  ( not correct, this should be 2.58 * 3 = 7.74 )

Asset financial Inquiry and BOOK, Category setups are in the attachment.