I now have an account with Hatch and Sharesies

As @sbiddle mentioned there is a ownership difference

With Hatch you have your own brokerage account with their custodian (FNZ) which means that you get voting rights and the ability to transfer shares with Sharesies that is not the case and to transfer you require to sell

This difference may not be material to many if a) you don't want to vote b) are happy to sell rather than transfer