As per the issue description mentioned above, you are unable to sign a pdf second time using your certificate signature in Adobe Acrobat, is this correct?
Could you let us know how you are creating the pdf - using File > Create option in Acrobat or from Create PDF option in MS Word for ex.?
What happens when you try to sign the pdf second time? Is there any error message?
Also, let us know the version of Acrobat and the operating system you have on the machine?
To check the version: Identify the product and its version for Acrobat and Reader DC
You may also visit the following link which discusses the similar issue: Multiple digital signatures
I am creating the pdf from a word document through the process of 'saving as' PDF. I have tried numerous possibilities, even if i scan a document in PDF it will only allow me to sign it once, or if it's a PDF form, it will only allow me to sign it once. The version of Adobe that i have is Adobe Acrobat DC & Reader 2015.
There is no error message when i try to sign a second time. All the options are grey and it won't allow me to select the signing option again. I have already visited that thread page for 'multiple signatures' and it is of no help.
Would it be possible if you can share one of the pdf files with us? We Would like to replicate the issue at our end.
You may share the pdf file via Adobe's Send and Track.
(1) Visit this link: https://cloud.acrobat.com/send
(2) Click Add files > choose files from my computer
(3) Select the file > create link. You can copy paste the link here in the forums or you can share it via private message.
To send a private message, left-click on the user's user name and click Message.
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There is a signature option: "Lock Document after Signing". If this is set, all further modifications (including another signature) are prohibited. Make sure this option is not checked in the signing dialog, and not (accidentally?) set in the Seed Values.