Ahle sunnat wal jamaat has believe that Aulia Allah by will and power of Allah can perform something that is normally considered impossible.
A muslim believe that Karamat is totally under control of Allah.
It is not related to the will or status of a person (Aulia Allah) .
It is by Allah will and not the Desire/status of person have much Role.
Sometimes a person other than Prophet may get Kramat from Allah.
Eg: Quran says that Hazrat Mariyam used to get fruits without season and Prophet Zakaria was not getting,But it does not mean that she became bigger than Prophet.
Karamat/Maujazah may differ for same person at different time.
Yaqub Alaihissalam could not trace from the well of Kunan But By will of Allah he could smell the cloths of Yusuf Alaihissalam from far away Egypt.
So if you will see the Karamat e Aulia with Muslim vision you will find the greatness of Allah.
Otherwise you may find something else if you consider that it has been done by the Aulia Allah, then it will become shirk,as Some of the groups are smelling Shirk in Aulia Allah Stories.
May Allah show all of us Right path.
Allah knows the best.