Upon saving, GB alters audio clip, stretching it from 4 to 4.5 bars

Here is the problem: I have a song with a 4 bar "real instrument" clip in it. I alter the song. Resave it as another file name. When I reopen the song, the clip plays back incorrectly (too slow). It plays over 4.5 bars, not 4. Sometimes, it actually shows the clip stretched out to be 4.5 bars. Needless to say, this ruins the song. I have not touched this clip between the time I play it ok, then save and it plays too slow.
Any suggestions gratefully accepted!
PS Although I just posted about this problem, I thought it had to do with the mobile pre interface, but that was a red herring. It is the same with the interface or with internal audio. Thank you.

For what it's worth -
I erroneously stated earlier that the "Mobile" quality video played well in QuickTime & iTunes. That's not true. When I converted/downlaoded the same video from Clip Converter using the Mobile settings, the sound is messed up in bot programsh. The specs for the filer are:
The same clip played & sounded well in both Quick Time & iTunes (but not on iPhone) when downloaded at Standard Quality (360p - specs in previous post).
I notice the FPS & the Data Rate of the "Standard" clip are out of parameter based on the requirements I quoted.
Really all I want to know is how to download some YouTube videos & get them to play well on my iPhone. If I can learn to understand the hows & whys, that'd be great too. But definititely secondary!
Cheers.

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