Lightmapping Issues

Hello, For some odd reason whenever I go to bake the lightmap its comes out patchy and broken. Here is a picture of what I mean: https://gyazo.com/c56b1a8aadf8d33195091a582a93a6e7 Without lightmapping it looks like this: https://gyazo.com/1101ca20bb56681fc61b39624e93e3e9 Here are the settings I'm using https://gyazo.com/fa460179f71f8b3e69201f9f91080b38

Before this started happening it was baking the lightmap fine, then all of a sudden whenever I do it now it just messes up.

Any help on how I could fix this? Thanks!