I use Firefox on my PC and sometimes get the blips Alan is complaining about. Usually the tiny text problem happens when I copy from either someone else's email or another website, it's because the formatting tags are copied alongside the text. I also sometimes get the double line spacing in Firefox. I use Safari when browsing on my iPad and sometimes, but not always, get the double line spacing. I rarely get the tiny text problem on Safari, but that's because I rarely copy and paste from elsewhere with Safari as I find it difficult to do on the iPad. I'm not entirely sure why these things happen, whether it's the platform the forum is built on, or the browser involved.
We can ask Mike, but I am completely at a loss.