Text style heading 2+ is showing up in the top drop down main menu, but I need to either remove it, or update it to Text style heading 2.

I cant update it by selecting it and use the update heading 2+ in this variant because the style is not showing as an option to select in the menu so I cannot select it.
I also cannot delete it from the drop down in the main style menu as it does not show up there either.

I can update the Text style heading 2+ by manually selecting it and using the main style drop down to change it to heading 2, but that will take a long time to move from page to page and do it that way, I need to use the auto sanity saving method

Can anyone suggest something to reset it or change it, in frustration tried shouting at it, but nothing happened