The call button below the name of contact does not work ?

Hi, I have been meaning to ask this question for the past several days as it seems to be affecting my phone only.

whenever you open a contact details, you can see 4 or 5 tabs below the name of contact :

message, call, WhatsApp ,Email depending on the contact.

my issue is that tapping the call button immediately below the contact name does NOT trigger a call.

however the message and WhatsApp buttons works as usual.

just check the attached screenshot. I cannot call a number by tapping the call tab.

however the call does go through when I press the number itself.

is there any setting I can change to modify this behaviour of call tab.

iOS 14.1