HELP: Weird shadows

I tried creating a level from scratch, starting with a blank level. The shadows look really weird (see link), and this is at Production-level lighting quality.

Screenshot - shadow1.png - Google Drive

(there was a database error when I tried to attach it)

https://scontent-atl3-1.xx.fbcdn.net/v/t31.0-8/15626390_10154693936145169_1808378435505799015_o.jpg?oh=c8a5f2c4b1f481f1ee8978d3dd41f8de&oe=58DAB405

you should increase the lightmap resolution on your floor object

Hi,
just increase the lightmap size.