Why is my touch bar disappearing on my MacBook Pro?

It's been like this for a while. Just started with the 'Siri' icon, it was only showing half of the picture... sometimes only a third of it. Now it's gone and the mute button has part of it cut off. I'm worried the whole thing is going to disappear. When I tap the black space where the Siri button was, it still opens Siri, but I can't see where it is. When I open the emojis also, the part where siri was (and a bit more) is cut off, so some of the emojis are cut off at the end until I drag them across/scroll further. I can't afford to have this fixed professionally... 😕