Inconsistent DOI export to bibtex

Hi everyone,
I just noticed that when exporting my zotero collection to bibtex, DOIs get handeled in different ways depending on the journal. E.g. for Science and Nature, everything is fine and a typical doi entry looks like

10.1126/science.1158877

However, if I have a paper from Physical Review B (seems as if all Phys. Rev. A-E, Phys. Rev. Lett. and Rev. Mod. Phys. are concerned), I get additional curly brackets around the doi:

{10.1103/PhysRevB.75.195341}

This seems to be problematic when using the new revtex-4.1 which provides links to the cited articles using the doi-entry.

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