The failure to display the signature when filling in the personal information of social security recruitment is caused by network delay and information filling error, as follows:

1. When filling in personal information for social security recruitment, there is network delay, the information can't be communicated with the server in time, the signing meeting will fail, and a good network is needed to operate.

2. There are omissions or irregularities in the filling of recruitment items, including the wrong ID number and irregular uploaded data, which will lead to the invalidation of the platform's audit system and the inability to display the signature. It is necessary to check the errors and correct them.