Hi,
The default route is an OSPF external Type 2 route hence the interface metrics will be ignored.
You could try using an import policy to deny or alter the metric of that route from that specific neighbor or interface.
Example:
policy-statement test { term test { from { protocol ospf; neighbor x.x.x.x; interface xe-2/0/14.0; } then { metric 100; accept; } } then accept; }
set protocols ospf import test
Hope this helps.
Cheers,
Ashvin