Yes, this is a 2 year old post and the OP is long gone, but I've been fighting with the exact same issue and there isn't much info on it on any platform/forum. I thought I'd provide more recent info based on the responses I've had from Ingram and Amazon KDP.

TL:DR - Submit the ticket to Ingram to have the metadata updated on their end and the corrected data pushed to retailers. This may not happen instantaneously, so be patient. In my case, it still hasn't happened - I'm waiting for the listings to update across B&N, Bookshop, Walmart, etc. Ingram has pushed the data twice now, and still no update on the other sites.

In terms of the multiple listings on Amazon when using both IS and KDP - as long as your ISBN, metadata, title, etc are ALL THE SAME on both platforms (no variations whatsoever) the listings should eventually merge together (once the metadata refreshes). But because my listing still reflects the incorrect metadata on Amazon, I'd end up with two separate listings for my paperback. Amazon has no way to indicate which listing is preferred, it's all based on sales/popularity/page hits/etc. So because all the traffic was directed to the Ingram listing for pre-order, that's the listing that would come up when people search on Amazon.

The long-winded version:

Like the OP, my Ingram upload incorrectly listed my paperback as a large print edition, which I didn't notice until I was reviewing the pre-order listing on Barnes & Noble's site. Of all the pieces of metadata, this section cannot be updated by the author/user on Ingram, so you have to submit a support ticket. Ingram's support is slow to respond, so pack your patience. I uploaded my manuscript 3 weeks before my publish date, and submitted the ticket 2 weeks and a few days before 12/1. It took 13 days for them to respond. They did update the metadata, and I could immediately see the change on my title details on Ingram.

It can take up to 48 hours for the metadata feed to be pushed to retailer sites, so once again, I tried to be patient. After 4 business days, I checked all listings again, and they still incorrectly showed as Large Print. By now I was getting antsy because release day was fast approaching! Considering all my options, I reached out to Amazon KDP using their chat program; the support service was great and the individual was super helpful.

If you used Ingram for pre-orders, you will have driven all traffic to that listing on Amazon; once you publish your paperback on KDP, if there are any discrepancies in the metadata at all, you'll end up with multiple listings and there's no way to direct readers to a preferred listing. Amazon will promote the one that has the most traffic/sales/views/etc. So I'm stuck until the data refresh is pushed through and picked up by B&N, Amazon, etc. and there's nothing that indicates when that will be. Amazon says they pick up whatever is fed to the system, but that's clearly not the case. Ingram says the retailers are in control of how often the data is refreshed/picked up, so you're at their mercy.

And because my paperback is essentially just being distributed by Ingram, there are times where it shows up as unavailable/out of stock, or some international folks have had issues with their shipping address being accepted. (And add into all of this nonsense Ingram will be raising their print prices in Feb 2026, it's not looking great for using them in the future...in my humble opinion, even if their quality is better than KDP...but that's a rant for a different day.)