Footer links affect negativly ranking?

Hello Guys!
I have added my site link in tge footer of my vBulletin forum and after 5 days the 2 power keywords dropped from #1 and #3 to position #7 and #8!

Will my keywords jump again or should I remove my site from footer?

Matt said we should not do it. The other google represetant in a webinar said that if its not a purchased link its ok to use footer links.

P.s using no-index on footer links.

Will be great to get answers from experienced persons and not from those give me a like...

Footer links affect negativly ranking?

Poster :
Zoti Media Group