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In Go, the map type is implemented as a hash table, and the order of key traversal during iteration is not guaranteed and can vary with each iteration, even if the map's structure hasn't changed. This is because, for safety and to prevent dependence on order, Go randomizes the order of key traversal on each iteration.

Therefore, the internal implementation of map does not support a fixed key order, and it can differ even without changes to the map itself. If a sorted output is needed, you should additionally sort the keys, for example, like this:

m := map[string]int{"b": 2, "a": 1, "c": 3}

// Get a slice of keys
keys := make([]string, 0, len(m))
for k := range m {
    keys = append(keys, k)
}

// Sort the keys
sort.Strings(keys)

// Iterate in sorted order
for _, k := range keys {
    fmt.Println(k, m[k])
}