Hi Molly,
I'm only in R11 so I'm not sure if this will be the same, but I got the same issue when using Labor Headcount, then doing the date dropdown and selecting YTD.
If you can highlight the new field that has the $ you don't want, and you have the option to edit that field, then you should be able to fix it!

Click on edit, and it should bring up this (or hopefully a similar) box:

I circled where the pesky $ is coming from, so if you change the format to Number, it should go back to looking like a normal number
Hopefully this helps and isn't too different to R12!
Edit:@Julie Batty I just realised this will probably be what you're after too. If you have a column that you can edit, you can change it to be in currency format