Sadras
Legend
I'm Greek and I have read a ton of inconsistencies and conflicts in Wikipedia. For example, Hades was included in the 12 Olympians for years, while he isn't. Wikipedia refers to Homeric tradition and Orphism as resources of equal weight as Hesiod's Theogony.
Not to give you more work but you might want to also look at Bibliotheca (Pseudo-Apollodorus) if you haven't already done so.
As for inconsistencies there are many and this was due to a variety of factors (including geography), definitely not solely Wikipaedia's fault. With regards to the 12 Gods - well you have to pick your 12 from 14, as there were a floating 3 (the last 3 on the list below).
1. Zeus
2. Hera
3. Poseidon
4. Ares
5. Apollo
6. Artermis
7. Hephaestus
8. Demeter
9. Hermes
10. Athena
11. Aphrodite
12. Hades
13. Hestia
14. Dionysus