Not a glitch in your app - it happens to me all the time I've just learned to live with it since it's not that common for me. I've found it happens with tables that have a lot of fields or variability in the default report versus the table home page, but never dug into it to find the exact pattern. This doesn't solve your issue in any capacity but if you have a report that you want to grid edit exactly as it appears you can just add &dlta=mog to the end of any report page and it'll open it in Grid Edit. Again - not a fix, just a workaround.
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Chayce Duncan
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