Episodes with same release dates displaying in wrong order

So, when episodes are displayed on a person's filmography page, they're usually sorted by episode order because this is determined by the release dates.

But, now that more and more complete seasons are being made available online on the same day, this creates a problem. Ideally, if a whole season has the same release date, it should be sorted by episode number, but apparently this isn't the case, and it tends to look a bit messy.

Here's an example:

(Taken from the filmography page of Aisling Bea)

From what I can gather, where the release dates are all the same, it defaults to sorting by the number of the IMDb page. So if the episodes happen to be added in order, it's all well and good, but if they were submitted at the same time and processed in the same batch, they might be assigned page numbers out of sequence, and displayed as above.

It seems like this could be resolved by having the sorting system default to episode numbers instead of URL page numbers when the release dates match - would this be an easy fix to make?