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copied!<p>I also get the same issue. It doesn't happen when you map the same object twice - it happens when you have a tree heirarcy of objects, and the same value exists in two places of the tree (but with different child values) When mapping the second instance of the item - it uses the child values of the first instance, instead of re-evaluating what the child values should be.</p> <p>Here is my example:</p> <pre><code>class Tag { int Id {get; set;} string Name {get; set;} IEnumerable<Tag> ChildTags {get; set;} } public void Test() { var source = new List<Tag> { new Tag { Id = 1, Name = "Tag 1", ChildTags = new List<Tag> { new Tag { Id = 2, Name = "Tag 2", ChildTags = new List<Tag> { new Tag {Id = 3, Name = "Tag 3"}, new Tag {Id = 4, Name = "Tag 4"} } } } }, new Tag { Id = 1, Name = "Tag 1" }, new Tag { Id = 3, Name = "Tag 3", ChildTags = new List<Tag> { new Tag {Id = 4, Name = "Tag 4"} } } }; Mapper.CreateMap<Tag, Tag>() .ForMember(dest => dest.ChildTags, opt => opt.MapFrom(src => src.ChildTags)); var result = Mapper.Map<IList<Tag>, IList<Tag>>(tags); } </code></pre> <p>In the result </p> <ul> <li><p>the first instance of Tag 1 (ie source[0]) and all of its children are perfect</p></li> <li><p>the second instance of Tag 1 (ie source[1]) has all the children of the first instance - it should not have any children</p></li> <li><p>the second instance of Tag 3 (ie source[2]) does not have any children - it should have Tag 4 as a child</p></li> </ul>

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