Rise: double image appearing in 3 column grid

Hi. I have 3 images loaded into a 3 column grid block on Rise. Each one appears with a duplicate of the image behind it, a little bigger, so you can see it is duplicated. If I change the block to single image, it is fine.  I have tried reloading this many times and also completely deleted the block and started from scratch. The images all still load with this dupe behind them. (I can't share an image here due to confidentiality, so I'm trying my best to describe it.) Anyone know how I can fix this?  Thanks.