Unfamiliar box pops up after typing a comma in any .js file

This strange box displays after typing a comma in my javascript files. It continues to display until I hit the escape key. It's very annoying.

Does anyone know how to get rid of it?

I have eslint enabled, enforcing airbnb javascript standards.

First picture is what i see after I type the comma.

Second picture is the box following my cursor as I type. It will continue to follow until i hit escape.