I'm vertex painting another texture onto my mesh plane, sometimes it works sometimes it doesn't.
There are solid black lines in the background, the vertex painting works as expected. However, in some areas, when I paint, it creates this jagged random pattern instead of a solid black line. And this is the result, instead of the texture, it just leaves the black instead. Compare the areas in which there is a solid black line, compared to this jagged pattern area. You'll notice that the texture is applied in the solid black line area, but not the messed up area:
How do I fix this? Or, what causes this problem? Thanks in advance.