Dates on the lower screenshot are the wrong way round, unless it's a different variation. When I try to change it, it automatically reverts to this way round.
You are talking about the year line comment. Would have been easier if you said so. You will run into these problems when you mix left to right and right to left writing. This has not much to do with Numista.
The first should have invisible left to right markers and the second uses an em dash which works better then a hyphen: ١٣٤٢ - ١٩٢٤ ١٣٤٢ – ١٩٢٤