Minecraft special characters buggen?

Does anyone have any idea what that is? Comes every time I type a special character in MC

Do you have any texture package or any other modification (such as LabyMod) active?

Best wishes.

Only Optifine

Thanks for your feedback, one thing is not yet apparent to me.

Do you have a texture package active?

Best wishes.

Could fix it. Was Faithful (or how to write it)

That was my fear that it was due to the texture package.

Thank you