Items Now Grouped After Mirror Or Copy Command

Hi,

Cutting it short, after i mirror or copy more than one item at the same time, the new copy of the items are now grouped together, with there not being a group / ungroup quick command i am unsure on what to do. 

For reference.... i have looked in the entity groups and nothing is in there to suggest anything is grouped.

Does anyone have any suggestions on how to resolve this issue?

Many thanks

Dale.