Can also be they have worked out a reroute which has taken the aircraft away from the choke point which is causing the problem or re-filed at another level.
This time of year there is strong northerly winds so they will want to run along the med then head north. Instead of heading north from Turkey/Greece up towards Germany. And all middle east traffic will have the same plan and also the summer season med flights will just be kicking in.
Then again it may be an arrival flow issue and then it's just luck if the slot gets brought forward.