I think you're confusing time-travel plots.  The one you're referring to 
here came at the end of season 1 ("Once in a Lifetime"), where Jack & Henry 
travel back in time 3 years - Henry to stop Kim's death at the hands of The 
Artifact, and Jack to stop Henry from changing the timeline and destroying 
the universe.  The characters "time travelled" by transferring their future 
consciousness into the bodies of their present-day counterparts, but it was 
a 1-way trip.  At the end of episode, the status quo remained, but because 
of the time travel method employed, future Jack & future Henry were forced 
to remain in the present and cope with the knowledge of what could have 
been.

The story you mentioned above takes place at the start of the current season 
(season 4), and revolves around actual time travel to the founding of Eureka 
in 1947 via an Einstein matter-bridge device. The principal characters 
return to the present along with a straggler (James Callis), and his being 
removed from the timeline results in some significant changes to present-day 
Eureka.  Even after 1/2 a season, there has been no global reset to the 
original timeline (although it was teased during the midseason finale), so 
all of the principal characters (Jack, Allison, Jo, Fargo, Henry) have to 
deal with their new reality AND keep their meddling with the timeline a 
secret due to the government's version of the Temporal Prime Directive 
(essentially, 'you travel in time, it's a death sentence') - although a 
couple of secondary characters, including Zane, have figured things out.

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