I have seen this issue on reddit as well, so I know I am not alone. I grinded pretty much nonstop and achieved the gilded Heavy Metal Title. This title appears to be bugged, as it does not count toward the Seasonal Rank 7 challenge "Claim a title." As said above, I have seen several posts on reddit complaining about the same issue, so I know I am not alone in having this issue. Please provide feedback to either confirm/deny whether this is a bug or not. It would be incredibly disheartening if it did not count, but as there are only a limited number of days left in the season I am debating giving up on the Seasonal challenges altogether if this is not addressed soon.