Custom Field Id changed after the upgrade

Recently we have upgraded the Jira to 8.3.4 version of our dev server. After the upgrade the Custom field Id has changed for “Story Points” field. Earlier it was customfield_10005. Now I could see two fields with same name “Story Points” with different Ids “customfield_10801”,“customfield_10174”. Please help me to resove this issue. I am not able to delete one of the field as the page is hanging when I click on Custom Fields.