Using GemPages on your product pages?
If so - you need to adjust the currency formatting.
On your Shopify Admin, go to Settings > General > and click "change currency formatting".
Instead of
<span class="money conversion-bear-money">$###{{amount}} USD</span>
and
<span class="money conversion-bear-money">$###{{amount}}</span>
Use
<span class='money conversion-bear-money'>$###{{amount}} USD</span>
and
<span class='money conversion-bear-money'>$###{{amount}}</span>
meaning - instead of double brackets (") use a single bracket (').
Save your changes and you're all set.