Closed captioning

Streaming Xfinity. Recent closed captioning was somehow turned on - just for Xfinity. Given the steps involved (going to the gear, accessibility, etc), it seems like it’s a system malfunction. We’ve tried multiple times to turn it off, but that option doesn’t appear. We’ve made a number of changes to try and get rid of or minimize it including setting the font and background to transparent. After a period of time or when the TV is turned off/on, it resets itself. Not to mention the captioning is in the middle of the screen. 
Any ideas? Anyone else experiencing this?