why is only one contact muted on my phone but the rest of my receive notifications

[KEHOE24]

Yes hi my question is I receive notifications from every other contact my phone only except for one on my Samsung S7 Edge I have read some Android forms and then try to take around and play but somehow only that contact is muted I go into the contact and it shows me nothing about ringtones any of that so if anyone could please help me that would be really appreciated thank you