All footage disappears after extending composition duration

hi,

 

i hope problem has relatively simple answer.

 

i creating animated infographic , had orginally set composition 30s long.

near completion of animation realised needed longer went composition settings , extended duration 90s.

 

however, after extension video still plays normal until 30s when disappears , composition reverts background colour.

 

how remain in place 30s complete 90s?

when extend duration, have extend layers too... make sure layers way stretched end of duration.

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