- HELP - Adsense: Drops deep in CPC

Hi BHW people,

I realy need you help.

I have 2 websites both running te same niche and content on is a clone.

For website A: i promote a post on FB and get +-0.12c / click adsense
For website B: i promote a post ( different post as A) on FB and get +-0.12c / click adsense

Now the 2 posts run +-1 realy stabel but now i get a huge drop in CPC for website B. 0.04cent / click

But website A is still running stabel.

Both running on the same target USA.

What do you think the problem is? The clone of the website?
Note: Website B is running also on a different Adsense account and different IP adres.

Please are there some adsense specialist that can help me?

How many impressions per day?

The CPC can also be seasonal as well - meaning that the revenue generated from advertisers are depending on how much they are willing to spend per ad thus, with varying budget and varying campaigns being run, that would affect the CPC in the process.
Also, the keywords on your article is important - the ads would detect the associated keywords and serve ads accordingly, thus, ensure that the right keywords are being targeted on your site, else, if just general keywords, then you can expect the CPC to have a seasonal behavior.