It should be somewhere in theme settings I believe, I’m not familiar with that theme. Although you can fix it via css, just add this piece of code in Customize\Custom CSS in Appearance section:

#vys-credits {
    text-transform: initial;
}

Let me know if it helps.

Thanks

You need to remove (or override) the text-transform: uppercase;

It starts on line 2297 of your style.css:

/*-----------------------------*/
/*--------FOOTER STUFF--------*/
/*---------------------------*/
#footerContainer {
	width: 100%;
	position: fixed;
	left: 0;
	bottom: 0;
	text-transform: uppercase;
	z-index: 0;
}