Copying the hash table to new rehashed table?

It's depend on your hashing function. In your case you should use key%size_of_table else slots after 7 will never be mapped by hashing function. These slots will occupied only when you chose linear probing in order to tackle the collision.(Where we look for next empty slot).

Chosing new size will help to reduce the collisions at early stage, else it would be the case table haven't reached the Load Factor still you are facing lot of collisions.

Important thing about the hash tables is that the order of the elements is not guaranteed, it depends on the hash function.

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