USPS - at Checkout, shipping option for "Standard" is followed by gibberish

[Johs]

I'm using zencart, with a Web Tools API for USPS shipping.

When I go to checkout, I get the following "gibberish" at the end of the Standard Mail option:



Does anyone know what's causing this or how I can fix it? From what I can tell, this IS the correct standard shipping cost (it's only sometimes cheaper than priority)