Adjustment amount after Changing prorate convention

Hi everyone

We have just changed the prorate convention from daily to monthly.

We have run the depreciation and for some assets we did not amortize them.

However, we don't understand how system calculate the adjustment.

Here is the screenshot of the financial information of an asset.

The first period after changing the prorate convention to monthly is 8-17.

If monthly depreciation equal daily depreciation then why do we have the adjustment amount, could you please let me know how the system calculate and get the '6.37' please?

This is our calendar.

This is our new prorate convention.

Thank you.