I removed a collection a few weeks ago from Lightroom desktop and it is still showing on both my iPad and iPhone. The deleted collection is gone from the website. I have removed many photos from the collection "iPhone Photos" on my desktop. They are all still showing on my iPad and iPhone. Some are still showing on the website. Some are showing grey thumbnails on the website, but say "image unavailable."
How do I delete collections from LR mobile on my iPhone and iPad? How do I delete the photos from a collection on my iPhone and iPad? Please don't tell me I have to go and delete each one individually.
Did you unchecked the collection from sync before you removed the collection within Lr Desktop. Could you try to re-sign-in to Lr Mobile and see if that helps.
I don't remember if I removed the collection from sync or not. I did try signing out of LR mobile on all my devices, signed back in on the desktop first, and then my iDevices. That removed the collection and most of the photos. Some photos that I deleted previously still showed up in LR mobile, but they synced to the desktop and stayed deleted when deleted from desktop.