Hmm that's trickier to pin down without seeing it, but if it's viewing an actual PM that is controlled by the postbit or postbit_legacy templates.
One possible thing, if you're using postbit (with avatar/username on top) is that if there's a lot of information in that top box, it could push the table out.
If that's the case, an IS_SCRIPT conditional on private.php can rearrange or reduce the amount of info that shows in PMs.
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