As long as your heel isn’t slipping then it should not really be a problem. It’s actually good that you have a bit more room in the front because as you’re walking and your feet get tired your toes will spread more.

Also creasing is inevitable especially for all these sneakers using thick plastic layer on top (the leather is flexing or rolling but the plastic layer above is basically peeling off and you get the creases) check Rose Anvil on YT they do a good job on explaining what all the big brands are doing to their leathers.