Hi PL2,
You have so many group applied on this interface:
apply-groups [ FILTERS-FOR-JFLOW AE-INTERFACES-TO-SPINE INTERFACES-TO-CORE-MPE INTERFACES-TO-BFB-CORE ];
I believe one of the group is making this part of a AE bundle, probably AE-INTERFACES-TO-SPINE, once an interface is part of AE bundle you can't apply unit config to it.
In order to see the effective configuration (interface level configuration + configuration applied via groups) you can use following command:
"show configuration interface et-0/0/58 | display inheritance no-comment"
In order to confirm which group is applying which part of the config use following command:
"show configuration interface et-0/0/58 | display inheritance "
If you don't want to use the interface as part of AE bundle remove that group from interface config.
PS: Please accept my response as solution if it answers your query, kudos are appreciated too!
Thanks
Vishal