The Infinity nuke creates an explosion crater at the position it is armed at, not at the position where the nuke is when the explosion happens. For example, if you arm the nuke, and then dig a hole under the nuke so it falls down, the explosion crater centre will be where the nuke was armed, not in the hole. This also means you can't use the nuke in TNT cannons :(. I'm guessing this happens the position of the ProcessExplosion is set when the nuke is armed, when it should be set when the explosion actually happens.

https://github.com/InnovativeOnlineIndustries/Industrial-Foregoing/blob/1.16/src/main/java/com/buuz135/industrial/entity/InfinityNukeEntity.java#L107

Industrial Foregoing Version:
3.2.14.7-16

Titanium Version:
3.2.8.7-22