I have already reported this as a bug in some of the previous releases, and it has been fixed. With the latest opera version problem is there again, just not the same (it was reverse order back then).
- So, have a couple of pages saved in speed dials folder, let's say "1", "2" and "3".
- Use Open all in new tabs option
- New tab (current, empty) remains - and tabs are opened in 2-3-1 order (if more than 3, let's say 4, the order is 2-3-4-1, where "1" is opened as last tab).
Interestingly, when Open in new window option is used - order is correct.