When designing blocks, it’s always best to create the geometry centered around the origin of 0,0. Sometimes users can create a block from geometry in model space and it ends up difficult to use when inserting the block.
To correct this, issue the BEDIT command, select the misbehaving block, then use the move command to move the block elements to 0,0. You may need to use a specific base point (such as the midpoint of a feature) to 0,0.