Delay in cast corrections

I've made several submissions (once in May, once in June and lastly today, July 18th) of the same cast corrections to the biofilm VISION (2009), about the 12th century nun Hildegard of Bingen. The corrections (see 160718-175523-586000, 160718-175707-610000) are not very earth-shaking: they just remove "(uncredited)" from the Attribute column, add or correct the credit order and add some new names. All the actors (except one) actually do have credits.
But for some reason my corrections have been ignored for over two months. Any reason for this? It can't have anything to do with processing times. I'm baffled. Many other items I've submitted have appeared promptly or at least eventually.
Regards,
Hutch-48