Does this look right? BB/Crank spacer issue-20181023_084719.jpg

Converted a stock Trek 29er 3x (Shimano alivo and i think the normal trek bb90) to a 1x with a RF 32T. However, when putting the drive side crank back on, there seems to be a nice gap between the BB and the back of the drive side crank, visible in the image. Do I need some kind of spacer, or is this fairly normal? Thanks.