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 https://www.brutto-netto-rechner24.de/rentenrechner.html

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

Thanks