Only one search result instead of two

[Konard]

var trie = new SuffixTrie<int>(3);

trie.Add("hello", 1);
trie.Add("world", 2);
trie.Add("hell", 3);

var result = trie.Retrieve("ll");

The result has only 1 as an element, however, there should be 1 and 3 as results.
And if you replace trie.Add("hell", 3) with trie.Add("hell3", 3), it works as expected (1, 3 are results).