For example, I have a website that is one year old with 2 backlinks. The home page ranked 33rd spot in Google. Then I get two new backlinks within a week, one pointing to the home page and one to an inner page (one naked url backlink and one anchor text). Soon after I got the backlinks the homepage ranks 50th spot. It's now a month later and still in 50th spot. That's a drop of nearly 20 spots.
But the same thing happens on other websites I own. If I get one backlink to a page it might do better in search. If I get a second one it ranks worse. Is anyone having the same problem? Meanwhile my pages with no backlinks often rank better than without.