Not to be dismissive, but would it help if we told you that you were in the most screwed up airspace many of us have ever seen?
FL280 isn't too standard for the BUBIN hold, but the routing via DARAX arrival has been going on for months.
There are pages and pages on this forum about what is wrong with the UAE, I won't make this one of them - 2 planes at the same level isn't standard but without more facts about distance to run to the hold, no one can tell you exactly how wrong.
As a side note, I did see a guy have two at the same level in a pattern at FL260! He was very lucky as they both did direct entry and went round and round not getting within 5nm.