I notice you’re painting the model as you build it.
To avoid errors you need to see the geometry you’re working with.
Unfortunately the materials that make the model look nice can also make it difficult to see the Edges (lines) with which you build the model.
It’ OK to paint the model as you go along.
But you’ll have an easier time working in Monochrome Face Style as you continue building the model.
Click … View > Face Style > Monochrome
Now if you view the model in Monochrome and turn on Hidden Geometry you’ll see a number of errors.
Click … View > Hidden Geometry
Notice the floor is distorted and the adjacent wall is distorted.
In the attached image the endpoint coordinates displayed by the Text tool indicate geometry in the area around the doorway has been moved up and out a bit.
SketchUp then automatically broke the floor and wall faces wall into multiple faces.
There are a few faces are reversed as well.
The backside (bluish gray) should face inward. The front side (white) should be facing out.
Simply right context click on the face > Reverse Faces