Start time not going to time specified

I am just trying out the free version before buying the pro version. I have successfully used the start/end times for several videos clips on the same page that are from the same YT video. But, I cannot get the last couple I have added to begin at the start times I specified. Instead, the playback starts at one of the earlier video start points. Is there a limit to the number of clips that can be specified for the same YT video on a single blog post? Any other thoughts??

Thanks, Mike

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