ERROR with US$ Currency

This plugin seems to have a compatibility problem with the MERCADO PAGO gateway.
When I select the currency in US$ it gets a message:

Does NOT allow values less than $15,000

I have already made transactions below this value in currency COL$ which is the default currency of the site and it works well with the same gateway.

I have already deactivated the plugin and everything works fine, the problem is when I activate this plugin and use US$ currency