In the slider widget options, can you try selecting the ‘Place link on button only’ option and see if that works.
The button works for me when I view your site, but I can see an extra closing link anchor in the telephone number in the top bar.
It looks like this </a></a> when it should be </a>. Not sure how that has happened, but it may have an impact as the browser sees it as incorrect html markup.
Additional: it looks like you may have added the menu text as <font style="font-size: 20px;">000-111-222</a>
You should write it as <span style="font-size: 20px;">000-111-222</span> instead.
I don’t know if this is affecting the slider button, but it would be worth correcting it just in case.
