I've tossed this suggestion before for weird issues:
If you type "opera:config" (no quotes, of course) as the address, there's a list of options. One of them is "fold linklists" (or it's in my version, anyway). Setting it to off fixes a couple weird - and apparently unrelated - issues for me, including wrong links and bad anchors.
No idea if it'll fix this one, but it's a benign setting.
-jk