Adsense did not pays for mobile clicks anymore

I had very low cpc over last weeks, after investigating my account I have finally find out the problem, Adsense pays about 6x less for clicks from mobile devices than clicks from desktop, I have 0.30 cpc for desktop in uk and have 0.06 for mobile device clicks, I have 1.98 cpc from australia for desktop clicks and 0.20 for mobile clicks, same happens for all countries, mobile clicks are useless anymore !?

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