Tile size problem

Questions
1

I’m trying to make a map to use in RPG Maker VX Ace. When I have the tile size set to 32, it only fills the bottom left corner, like this:

Is there any way to fix this?

2

Looks like you have the map’s “grid size” set to 64x64 (or close to that). The grid is clearly larger than your tiles.

3

In the left “Properties” panel, you can set your map tile size to 16x16, and the map should look fine.