The subject wants to ask, "What caused the electronic signature display to fail?" Electronic signature shows that the failure of comparison is caused by the following reasons.

Incompatible 1. file format: If the file format is incompatible, or the signature software used does not match the file format, the electronic signature will not be displayed correctly.

2. Expired or invalid certificate: If the digital certificate is expired or invalid, the electronic signature will not be displayed correctly.

3. Document tampering: If the document is tampered with after being signed, the digital signature will be invalid.

4. Electronic signature software failure: If the used electronic signature software fails, the electronic signature will not be displayed correctly.