FA-Run Depreciation-Rolback-Draftmode-Final mode-Rerun Depreciation

Hi expert,

need clarification ,pls share your input;

1. is it due to any modification done on those particual asset that why this rolback of depreciation are coming automatically ?

2. Henceforth after rerun the depreciation without closing the period it will calculate the depreciation again on those rolback of depreciation created on those particualar asset , pls confirm.

3. is it rerun of depreciatiosn will create double deprecaition debit or it will create fresh only and it will delated or replace the old depreciation balance for any particular period without closing the period.

3.Is it depreciation run without closing the period are called as dep. run on Draft mode & run after closing the period are called as on final mode, pls confirm ?