When looking at the grave with a mod like Jade, the grave will simply appear as "entity.enigmaticgraves.grave"

Also the Grave Finder in JEI has "info.grave.remove_grave" listed as it's message.

You must be playing on an older version of the mod

Source: https://github.com/Quarris/EnigmaticGraves/blob/master/src/main/resources/assets/enigmaticgraves/lang/en_us.json

The latest version on curseforge,1.6.1, does not contain those entries.

It seems to come from here: https://github.com/Quarris/EnigmaticGraves/blob/master/src/generated/resources/assets/enigmaticgraves/lang/en_us.json

Weird, I'll have a look

Should be up for 1.6.2