No Such Symbol on some pedals

I’ve just noticed on some of the pedals (I haven’t been through them all) that some off the knobs are non-functional with text over them that says " No Such Symbol [gain] / [slider] " The only way to alter the sound is through the settings cog. Is this normal or should I re-install the pedals?

This is probably a bug in the plugins or mod guis. It’d be great if everyone who notices a bad plugin would mention it in this thread.