at random when i load into minecraft, the textures are off, worlds, servers, even the menu sometimes does that.

It happened after i put some resource pack into my world, and ever since the texters have been have, i don't have the resource pack anymore, and the texture will randomly go out of wack, it doesn't happen all the time, and not always the same thing, but it is annoying and i hope this can be fixed or at least give me an solution to my problem.