In season 1 of Dark, Ulrich, in search of his son goes through the portal in the cave and ends up in 1953. Throughout the show, they keep saying that one can either go 33 years in the future or 33 years in the part, then how did Ulrich go 66 years back? What am I missing? Also, how did Jonas in season 2, go from 2052 to 1921? Is this because time is cyclic? So he goes to the future but winds up in the past?

PS: I am currently on season 2 episode 4, please don't reveal information from forthcoming episodes. Thanks.

In season 1 of Dark, Ulrich, in search of his son goes through the portal in the cave and ends up in 1953. Throughout the show, they keep saying that one can either go 33 years in the future or 33 years in the past, then how did Ulrich go 66 years back? What am I missing? Also, how did Jonas in season 2, go from 2052 to 1921? Is this because time is cyclic? So he goes to the future but winds up in the past?

PS: I am currently on season 2 episode 4, if the answer involves information forthcoming episodes, spoiler blocks would be appreciated.