Weaver II has responsiveness and mobile on by default, you have to actually check options to stop each of them.
You have set your site to have a fixed width which kills the responsiveness. This is in Main Options > Layout > Theme width fixed that must be unchecked.
For Mobile, the setting is in The Mobile page > Disable mobile support box that should be unchecked.
The theme will not be compatible with any plugin Mobile mode, so you must disable jetpack mobile mode (or any other plugin mobile mode).
If you still have issues after that post back with the above options uncheked