Steam games keep validating
After every update, it requires that you restart the client properly.Or there can be some incorrect configuration with your client and a complete restart would fix it.Another remedy is to open the game you are playing directly from its installation folder. All the games that you install are independent applications present with their executable present in the local files. If there is still an error, you can proceed with the other solutions listed below.
It's okay if you can't help, but if you have any experience with this issue, it would be great.
In the ideal case, the files should be replaced or removed.
If not, you should try running the verification check again.
The manifest on the Steam servers contains the list of all the files which are supposed be there according to the most recent update.
If the manifests don’t match, Steam declares that there is an error and one (or more) files failed to validate and will be reacquired.