Hi @aneontherocks,
Because you’re rotating a custom object, it may have a different pivot point which is not centred - I’m unsure of how this is specified in the object, but it does seem that it’s slightly off-centre.
I suggest recreating & grouping your object using CoSpace building objects in Library > Building.
@Stefan, this is fuel for my comments at Rotation origin - Manual vs CoBlocks & Scripting - #2 by Stefan and feature request at Animating characters using turn blocks - add visualisation of origin/direction
Geoff