Adobe Sign - Digital signature on multiple pages

I have a pdf plan set of 20 sheets and I uploaded it to adobe sign. I have my digital signature setup and am using the fill and sign feature. I digitally sign the first sheet then when I try to sign the second sheet, I get an error message stating only one signature allowed in the document. I did finish the signing and exported it. I opened in Adobe and it shows certified, 2 dig signatures, one visible and one invisible. 

Any help would be great.