Image alignment not working

I have set up a bbpress forum on this website and I’ve used your plugin to make it easier for users to format text and insert images. When we try to upload an image, the alignment chosen is ignored. So if we set it to right align or center align… it reverts back to the default left align without text wrapping. Please advise how I can fix this

The page I need help with: [log in to see the link]