Resource Packs

I got a resource pack, i installed it but i didn't like the resource pack,
so i went back to vanilla minecraft textures, but when i did go back to the default texturepack all the fonts were messed up you couldn't read a thing. (P.S. i used the doku craft resource pack)

Steps to Reproduce:
1. install and use resource pack
2. go back to default minecraft texture pack
3. BOOM! fonts are messed up