If a website is new - its happens and the clicks made on Link ad units (that’s the reason also)
though link ad’s CPC is around $0.01 to $.03 (Generally) and if a website is new and dont have good traffic & traffic source CPC may also very low (lower than $0.01 too)
Don’t worry - focus on traffic & quality content
this is one year old website. shall i contact adsense?
you may contact - if earnings are not updating regularly.