Facebook: How do I stop this?

[pri✍]

If you tag a person in a pic that say part of your album, it means you link that person to that pic in that album. So that person after viewing that particular pic, he/she can view other pics in that album.

That doesn't mean they're tagged to other pics.
Do you really see that person's name tagged in other pics in that album?
If it does, it's FB glitch that you can't do anything about it but remove the tag on that other pics. You might also try to untag the pic that you really tagged it yourself & see if the tagged to other pics in that album is automatically removed.