good question… but since I don’t know what sites and have and don’t have redirects, I don’t know…
I have very simple redirects I do in meta tags (so they also w/o JavaScript…) they work fine in all browsers, Opera mobile is the only one where I have seen this very odd behavior…
I have also not good experience with Opera on my mobile phone device. It is very slow so instead of using opera browser on mobile device I will prefer firefox browser. This is pretty much faster than Opera.