conflicts with Goyo plugin

I frequently use the [goyo.vim](https://github.com/junegunn/goyo.vim) plugin for writing markdown. I currently have these relevant settings in my vimrc:
```
let g:mkdp_auto_start = 1
let g:mkdp_refresh_slow = 0
```
When I open a markdown file in Vim it automatically opens in the browser as I would expect. When I then enter Goyo layout using the `:Goyo` command my browser (Brave) opens the file in several more tabs (7 to be exact). I can close the tabs and things work like normal but then when I exit Goyo and return to the default Vim view it opens another tab.

I haven't figured out if this is a problem with markdown-preview or with Goyo but open to suggestions of how to fix.