This has been brought up before and seems like someone marked it as a duplicate for some reason, couldn’t find the duplicate and it certainly not fixed:
If you pause the game during the sequence and take a look at the generated LevelSequenceActor and in particular Random Start Time setting it’s always checked whatever the settings you’ve made in the blueprint. Below is a blueprint that generates this bug and circled is the discrepancy between the settings and the actual result.
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I already made a bug report in the link you described 3 hours ago. I didn’t know if I should’ve posted that on here since I haven’t got a ticket or a number for the bug.