Pinterest-Button does not appear

Hi,

asked the question alredy some month before. Pinterest button is sometimes shown, sometimes not. Does anybody else knowes that issue? Maybe there is no support by the developer.

Example:

Pinterest button visible http://www.brutto-netto-rechner24.de/rentenrechner.html

Pinterest button not visible http://www.brutto-netto-rechner24.de/krankenkassenvergleich.html

Thanks