I had this happen once while putting together a pretty big accumulator. The app froze after I hit confirm, so I had no idea whether the bet had actually gone through. I didn’t try submitting it again straight away because that could have created a duplicate. I took screenshots, checked my bet history from the browser, and then contacted support. These days, whether I’m using moors betting online or another sport betting site, I always check the bet history before doing anything else.