Someone early on in the process made a typo in a form somewhere, then:
I get paid to process orders, not proofread
I get paid to manufacture the sign, not proofread
I get paid to package the sign for shipping, not proofread
I get paid to put the sign up, not proofread
And good for all of them, they're right. Quality control should be paid for, and if you're not being paid to do quality control, don't fucking do it.