I sometimes get no achievements/badges, especially in the section “XP badges” and “Ghosts”. The other sections had no missing badge so far.
Currently it’s the Fuji x10 badge that you should get at 123900XP, I have 127580XP but the badge is still not active two days later. Usually I’ll get the next badge after reaching it and the badge before that is also activated together with the new one. Happened a few times now.
Similar with the ghost badges, I was wondering how they work because I didn’t get any after the first two or three and after some months I suddenly got the 666 badge and a few ghost badges that were missing all the time.
Maybe this bug happens a lot for me as I often use the undo function. E.g. if I got the actual grammar point that was tested right but mess up with something else like a godan verb conjugation I undo, fix my error so it is counted as correct again (I don’t see a point in getting one grammar point all over again if my mistake had nothing to do with it). Also I make a lot of typos which I undo and fix.
I only use the Bunpro shortcuts and menus, I never use the back button of the browser or something like that. Browsers are Vivaldi (Chrome engine) on Windows 10 and iCab (Safari engine) on my iPad.