Laravel find:: returning all rows

I am using : dd(User::find(1)->get()); on a table that has 4994 rows, and the above query returns all the rows. But when I do :

User::where('id',1)->with('groups')->get()

, I get the right row(just one)

User table has a column called id, which is primary key.

I am using Laravel Framework version 5.1.31 (LTS)

Could anybody tell me what the problem is ?

via Chebli Mohamed