Hi Luisa,
I just checked the page, but the output looks okay on my end. There is one custom CSS rule I see you have, to change the input background and the font color, which causes the white line below the input bar, but aside from that it looks okay. If you remove that, it will resolve the white line problem as well.
The error messages within the console seem to be coming from the page itself. Could you please try de-activating the plugin, then refreshing the page to see if they persist? I’m almost certain they will. It looks like a google plus share button script of some sort.