Try in control panel "Settings" -> "Permalinks" choose some other type of display links and save.
keagan_Hartmann answered on June 10th 19 at 14:26
Update duplicator. In one of the last versions had a bug that changed in the database the % symbol, like this rubbish. Update the plugin for me personally, this problem is gone.
the solution for an already established site with the bug:
1. downloading the database to an sql file, open the editor
2. do a search/replace with
3. save fill base.