This was first thought to be an issue between URxvt and W3m-img and I apologize for immediately closing bug reports and dismissing comments about this.
I spent yesterday trying to fix this issue and found out that launching neofetch with `--bold off`
reduced the rendering problems. I did more digging and found out that removing all text formatting fixes the issue entirely. I later found out that adding a single unformatted character before the formatted text fixed the issue while keeping the formatting the same.
I opened up this PR https://github.com/dylanaraps/neofetch/pull/358 which added options to enable a border between the image and the text to fix the issue. **[@konimex](https://github.com/konimex)** later commented informing me that we could just use a `zero-width space` to fix the issue and that we didn't need a new function/args/ugly border. doh
The final fix was as simple as adding a zero-width space before the info, here's the commit.