After playing for 4 hours Minecraft: Java Edition i exited out of fullscreen mode to check something on my other screen, then when I came back and opened up Minecraft and pressed F11 to turn it to fullscreen again this happend (See the two first pics). Then when I tried to reload the resources by pressing F3 + T it changed once again and all textures in the game broke completely (See the two last pics). At the time I had open discord on my other screen and a Minecraft server.