Float a purple colored container behind your viz (or change the dashboard color to purple). This will get rid of the line under the title. It's hard to tell what's causing the lines that runs through the number. Go to the worksheet and take a screenshot of the entire Tableau interface so we can see what's on what shelves.
I attached a packaged workbook with my problem!
Paula, sorry about that, the forum stream doesn't indicate attachments. It's best to mention attached workbooks with your questions.
Anyway, go to Format Lines, Grid Lines and set to none:
The only way I know to get rid of the line under the title is to use the trick I mentioned above.