can't reply to comments?

hi, for context. student at uiowa. frequently put in time out. one day i just stopped being able to respond to comments. i can comment on posts but i have a really weird glitch where i can't reply directly to comments. this is deeply annoying because sometimes i use yikyak for help and the only way i can respond is by dming people. but of course some people turn their dms off because people get on yikyak to try and hook up. not really sure why i can comment but not reply. i have deleted and redownloaded the app a couple times and genuinely nothing works.