There could well be other dimensions that cause this issue, until someone uses it and realises, it will go unnoticed. These applications are huge, I have no idea how big the dev teams are on them and the amount of code involved, there are always going to be bugs, some bigger than others, some affecting more people more obviously. Perhaps saving your files for web as jpegs in future is the way forward, the format is the same but they will place at the correct size, the other option is to continue and check each time you place a file that it has placed at the correct dimensions. Sadly, finding the fault on this user forum won't get the problem fixed, the majority of people here are users like you and me, although sometimes Adobe staff check on the forums. Best bet is to use this link Feature Request/Bug Report Form explain the problem, include a link to this forum post so whoever looks into it can see that the problem is reproducible on other systems by other users and hope Adobe fix it soon.
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