I don't know much but I suppose you're using IFTTT ? I think it's coming from there, as if you put a steemit link in a Tweet, it's the steemit's meta tags that are used by Twitter and this problem doesn't exist.
So I suppose it comes from IFTTT. Maybe try with a steemit link posted directly on Twitter (not through IFTTT) to see if the problem is still there.
I don't know much but I suppose you're using IFTTT ? I think it's coming from there, as if you put a steemit link in a Tweet, it's the steemit's meta tags that are used by Twitter and this problem doesn't exist.
So I suppose it comes from IFTTT. Maybe try with a steemit link posted directly on Twitter (not through IFTTT) to see if the problem is still there.