Front shifter moves when shifting rear, is this normal?

This is likely a rookie question but I just finished routing my Di2 11-speed Shimano Dura ace 9150. I’m testing everything before installing the bottom bracket. I noticed when I press and hold my rear derailleur shifter to move it up and down that the front derailleur trims with it as it shifts. I’m assuming this is the syncroshift technology but I’m a bit unsure if something is wrong or not. All help appreciated.