Yes, I think this is only for signature campaigns. You can join Facebook, Twitter and content campaigns. So, your stake allocation will not be determined by your rank.

Yeah, I think it's normal. Actually, that's since I was new to this forum. Yeah, when I was newbie, my stake was also different from the Sr. Members, Hero Members and Legendary. And I think that's normal.

If you want to get the same stake allocation with Legendary, then your rank must be able to reach legendary.