Exporting to Blender?

Question

OpenGL

Good afternoon! In blender, I create a cube on which I need to apply a texture. Let's say I want to use the following type of text:

As you can see from the picture, everything seems to load well in blender, but when I transfer it to my program, I get the following result:

And this behavior is generally incomprehensible. It is worth noting that my loader works with triangles, but that's not the point, since I export like this:

That is, you can see that I use triangulate faces. I would also like to note that I have previously loaded models with textures, but the models were not created by me. Does anyone know what could be the reason?
PS. I'll throw in a couple more images.

Answer 1

the problem was solved by selecting the object in edit mode, and using the edges split option