On recent threads, the order and dates of posts has changed, Here is an example:
1) Original post is at top, then newest post beneath that. The usual way on my machine was with newest post in order.
2) Dates make no sense. For example, there will be posts for "yesterday" separated by one from 2017.
I saw some crazy post sequencing yesterday too but only in the main forum page.
Post timings were all over the place for ~30 mins.
There they should be in chronological order with latest at the top but there was a mixture of post times, some 10 or 15 minutes later than they should have been. Doubles too.
The server was having a wee hernia I suspect but not noticed anything out of place since.