Unlocking heroic monlith

Hello. i just completed the 100 regular monilith finishing all the regular monliths. i went around clicked on all the chests they unlocked 69 and 55 heroic monolith, theres a path between 75 and 90 that wont open up for me to walk through is that why the other monoliths wont become heroic availabe to run.
just finished 55 heroic monolith and still none of the other timelines are unlocked heroic wise thank you alot.

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