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Reverse journal cannot be deleted and this affected the fiscal year creation period

hi im new with erpnext…

i tried to create the correct fiscal year for period 2020 - 2021 ( 01/08/2020 - 31/7/2021) and delete the wrong fiscal year which was created wrongly by my colleague for the period of (01/08/2020 - 30/04/2021) but i cannot delete it because there were reverse journal that supposed to post for 2019 but posted date wrongly to 2021.

Please help. how to solve this? The reverse journal is showing cancelled. but this affected the fiscal year that i tried to delete.

And i cant create the correct fiscal year… it says overlapping. what should i do ?