Video Tracks not shown after render / export + Exceptional Render time for Audio (CC17)

the project working on has 2 hour master sequence.
from master sequence have generated several nested sequences.

from nested sequences editing film 2 minutes long.

 

in final output sequence have 5 video tracks , 6 audio tracks. 5th video track adjustment layer grading using lumetri.

 

now few things don't work on setup:

 

1.)

when wanted render final 2 minute film output sequence, gave me estimated time of 50 hours, later 6 hours render audio.

i figured might have render audio of master sequence first, did , helped: export time went down 5-6 minutes. time difference not understandable.

 

2 , more important)

weirdly if there video on track 3 underlying video on track 1, in exported version render out , show video on track 1, while in program monitor show me correct video of track 3. huge problem. have tried several things overcome , solution downsize video single track. so, proper output. bad workflow obviously! 

 

btw:

this happening on premiere cc17 11.0.0. (154) on super fast computer.

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