They might not be adding you because of that. They might've just happened to see you there, then checked out your profile in a new tab, then decided they wanted to add you and did so from the leaderboard, resulting in having that default message.
...that's a little far-fetched, but it's possible.
a generic message
Funny, I've NEVER been on the "leader board" no would I care,..
So yes, I clicked the ignore option on those requests,...
...that's a little far-fetched, but it's possible.