Several posters have commented on the system's apparently putting posts out of order.
I can't claim to have much knowledge on how the system works in the background but my understanding is that posts are ordered by DTG.
Having said that we did have a period some time ago when the system went a tad strange and was logging incorrect DTG. Perhaps we are revisiting that situation again.
Either way, if you can tolerate the problem for the short term please and I'll refer it to the experts for attention.
Indeed, this post has been logged as having been made about 8 hours before it was made and posted in that incorrect DTG order - how quaint.