its normal...just read what it says when told go back,,,,its due story line ...they all will be open later while u progress main story
ps after u finished quests in Dark Valey you can go back to Bar trough Forest..BUT think twice ,forest is not a picnic place
I personally ENJOY it ! driving in my Lada trough forest
...once and a while i would stop to explore woods (yes there are good hidden stuff ) and to get some artefacts