Check if graphs are Eulerian

Question

I've been checking whether these graphs are Eulerian;

I've come to conclusion that all of them are Eulerian, because they're all connected and all the vertices are of even degree. However, when I checked whether or not these are Eulerian with a piece of software called Graph Theory, it said that none of them are Eulerian.

Is it me that is doing something wrong or is it that piece of software? Picture for reference;