Found an error in database - Page 1

In tracking my pups ped, I have noticed 4 generations back that one line is not right. It continues to be wrong all the way back to the beginning of the line. It shows unknown on sire and the wrong dam name, so it is off more and more the further back you go. (by the way, I have records back 8 generations for this line) How can I fix this without screwing everything up?

I noticed the "unknow." has many many siblings leaving me to believe that someone used this name to group a ton of GSD's as progeny without knowing the correct information...??? http://www.pedigreedatabase.com/gsd/progeny/404417.html

nevermind, fingured it out.