If objects are in a group and you nudge them beyond the bounds of the group, unexpected behaviors can occur.
I've experienced two different but related problems when nudging objects that are in a group:
1. If nudging a hotspot that is within a group, I can only nudge it once, after which the group will be selected unexpectedly rather than the hotspot within the group. Successive nudges move the entire group.
2. If nudging multiple selected objects (all within the same group), the objects will lose their alignment once they push beyond the bounds of the group.