I created folders in similar way and uploaded images but after creation of 12 folders not able to view and access new folders i.e 13 th folder and so on in Touch UI but can view then in classic UI and in CRXDE.
Oh OK. I just created 18 test folders(sling:Folder) and images in it as shown below. It's correctly showing up in Touch UI.
There is no issue in OOB dam folder creation in dam.
I remember having similar Touch UI issue in AEM 6.1 after debugging a lot we found out one of the folder's JCR node was corrupted or did not exits. This looks like similar issue. pls check/compare all your child folder and its jcr node properties with perfectly working folder properties,