NodeBB not sorting by date

[kb57442]

I'm using NodeBB 1.13.2 and used the write API to upload a bunch of messages from another software into NodeBB. I needed to update the date so I modified the date of each post (using mongodb). The dates for each post are showing the correct date but when I try to sort via newest or oldest it doesn't sort by date order?
Is there something else I can do to get it to sort the posts in a topic by order? I've already deleted the indexes in mongodb and restarted nodebb to rebuild them but that didn't fix the problem.

Any ideas?

Thanks,
Kyle