What is this?

I just installed Adsense to my site and after one day my site rankings dropped. all of my pages rankings got dropped result traffic drop. there's no manual penalty. not even any algorithm update. I don't know why this happened. can you?
This happened to me once before that time the reason is I installed the contents table on my site. but after 10 days rankings got back to original position.
It has been 3 days but nothing happened yet. will it come back and does this because of adsense?

I don't really think the issue is the AdSense code. There has been a ranking update though recently.

Geasy said:

I don't really think the issue is the AdSense code. There has been a ranking update though recently.

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Okay, let's assume its rankings update but on my site, many of webpages are white hat SEO, why did their rankings got dropped?

id say coincidence, but then it seems a lot of people are recently facing this issue