User is trying to make an entry in the Time Card and enters the project name in the Project field to search for it in the drop-down, but the search does not yield any results. The project ID is different from its name and it seems the drop-down search only works when the user enters the Project ID.
This can happen if your projects are set to display as Project ID - Project Name in Settings > Projects > General and you have set the drop-down search to match the starting character in User Settings > Display Options. To be able to search by the project name, you can either change the User Settings option to the default Match anywhere or you can prefix the wildcard character (%) before the Project Name in the drop-down. Check CORE Help Center for details.