2 euro coins possible with eror [solved]

I am not sure how common is this error but I saw on ebay I think simmilar coins with eror ranging in price between 100 and 500 euros. So I would like to know if this kind of eror is anything special and if it is what is aprox the value. (the front is normal on all of them) Thanks in advance.               

 Any chance of telling us what we are supposed to be looking for? 

Just saying ‘error’ does not help. 

Sorry, it is some sort of a buldge that other normal coins do not have. I suppose because the machine pressed too hard?       (first is normal to compare)

The value is what someone will pay.

offered on ebay is not the same as sold .

Just like that, I would say it's worth 2 euro and not more!

Ah yes, i feared that. Tnx.