Pre-upraded and post-upgraded items in Velious

[Scryll]

After raiding on the beta for a few weeks now, I have a concern when it comes to the items. Some items are post-upgraded already while some are pre-upgraded. May I ask why? Either stick to pre-upgraded and wait 6 months to post-upgrade them as they were on live and keep it classic. Or just put everything as post-upgraded, there is no reason to have it mixed, it just feels wierd.