There are two possible explanations for this:
If the former, patience is key - this site covers thousands of entities, and all must have a manually created description written.
If the latter, try renaming the property - 'Domitian as Caesar' has no description, but 'Domitian' does.
Reverse: ΒΑΣΙΛΕΩΣ ΑΡΙΟΒΑΡΖΑΝΟΥ ΕΥΣΕΒΟΥΣ ΚΑΙ ΦΙΛΟΡΩΜΑΙΟΥ Athena standing left, holding Nike on outstretched right hand and shield and spear in left hand; in upper right field, monogram; in lower left field, crescent and star; in exergue, [Θ].
Die Orientation: 0 H
Weight: 0 g
Reverse: Athena holding spear and Nike, shield at her feet; BAΣIΛEΩΣ / AΡIOBAΡZANOΥ / EΥΣEBOΥΣ / KAI ΦIΛOΡΩM, star over crescent / HXA / IA
Die Orientation: -
Weight: 3.76 g
Cassius Longinus had him executed in 42 BC because he would not allow more Roman intervention in his kingdom.
Reverse: ΒΑΣΙΛΕΩΣ ΑΡΙΟΒΑΡΖΑΝΟΥ ΕΥΣΕΒΟΥΣ ΚΑΙ ΦΙΛΟΡΩΜΑΙΟΥ / Athena standing left, holding Nike, spear, and shield; star and crescent to left, monogram to right, IA (date) in exergue.
Die Orientation: -
Weight: 3.54 g