The statistics in oneboxed topics are only correct at the time of the onebox creation. This causes pretty weird behaviour.
19 hours ago, zogstrip created a onebox of another topic. At that time, that other topic was 12 hours old. So the onebox showed that correctly. But the onebox is 19 hours old, so the oneboxed topic is 19+12 = 31 hours old at this moment.
It is pretty counterintuitive that these statistics are not updated. The number of posts, the amount of views, and the moment the last post was made can and will change. The only static bit of information is the moment of topic creation, and that is shown relatively (i.e. ‘12 hours ago’ instead of ‘Saturday April 6’) so that’s guaranteed to be incorrect.
The topic is here
And you’ll see this onebox information being stuck on “last post 7 hours ago, created 20 hours ago”.