That could be because some scoreboard plugins are outdated, However I do have a suggestion for you:
Try using Skript for your scoreboard, you can ask in the Skript category of the forums for help or look at tutorials on how to make them.
This is most likely due to a rollback after your server crashing. There's not much we can do on our end however to try and prevent this from happening again I suggest you do the following:
- Be sure to save your server regularly with /save-all
- Edit your configs with a text editor such as Notepad++