Is there a maximum number of digital signature fields supported in a single PDF?
I have a form that is signed by seven people in an approval circuit.
After five signatures have been applied, the finger cursor no longer appears when hovering over signature fields yet to be signed, and digital signing of those fields is not possible.
Sounds like your 5th Signature field might be making the others read-only
Look at Properties>Signed for the 5th sig field and see if anything is marked as read-only. If the other sig fields are marked read-only it would do what you are describing. (effectively locking those fields)