CrazyGecko’s answer would make sense if this was happening to all the journal titles, but not just this one.
I will bet money that the autosettings have pulled the Journal and Alt Journal fields into your Journal Terms list, and it is replacing the field due to directions in the output style to replace the Journal with an alternative from your Journals Terms list.
If my interepretation is correct, then you need to either edit your terms list, or edit the output style along the lines recommended by CG,or change the style to “as entered” rather than to replace with an abbreviation or full name.