[jdiehl]

If you inspect the element with Google Chrome, or some other development tool you should notice that the total is surrounded by a span class by default. The span is going to look something like this:

<span class="help-link" onmouseover="javascript: viewTooltip(this, 'Order subtotal does not cover discounts and extra costs like shipping charges, etc. The final cost of the order will be calculated at the checkout page.');">

So you can remove it in a couple of ways. You could open the relevant mini cart templates and remove this all together so that you don't get the little tooltip thing popping up. Or you can look through your main.css file and find:

.help-link {
border-bottom: 1px dashed black;

And either remove the border bottom, or change it to solid, or change the color to a grey so it's not as prominent, or however you'd like to improve the CSS to make it more to your liking.