Texture Creation Problems

I make a texture using XWE and then I place the texture in the map I'm working on, using Doom Builder, and it looks fine. But when I test the map, it turns into a hall of mirrors

Are there any solutions to the problem

There are solutions to most problems. What are the texture's dimensions and which source port are you testing the map in?

The specific texture is 256 width by 128 height and I use Zdoom for testing the map

The dimensions are OK so it's more likely a case of ZDoom not being able find your texture, was it added to a TEXTURE1 lump or placed between TX_START/TX_END markers? There are other possible causes so the quickest way to get a definitive answer might be to upload the wad for examination.

It is in a TEXTURE1 Lump
:EDIT: I've fixed it now, the first texture in a directory is always a hall of mirrors