Hi @Sam,
Per my test, this should be an expected behavior. If your colleagues share the files with you by sharelink, you will only have the access to the files they shared with you. You could access the folder, but only the files they shared is visible to you. If you want to see all the files in the folder or library, you need to be shared with the whole library of folder like following
You could also check if you have the permission to the folder by Manage access.
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