NHL series price question - confused

[Mediocre_Player]

Detroit/Anaheim western conf. final is 2-2.

Pinny has the series prices as:
Anaheim: -108
Detroit: -102

Now Detroit has home ice for games 5 and 7. They are a -130 favourite for game 5, tomorrow. In their other two home games this series they were around -130 as well.

How is a team that is a -130 fave at home, getting 2 of 3 games at home "less favoured" to win the series?

Something doesn't seem right.