Membership/Contribution does not get updated
We are having a similar issue, and while this isn't a great answer, the temporary solution has been to install browser add-ons (either in Firefox or Chrome) that clean the cache with one click. On Firefox, I'm using Clear Cache, which also refreshes the page. On Chrome, I'm using Clean Master, and have to manually refresh the page afterwards. Cleaning the Joomla and Civi caches don't seem to make a difference - only the browser cache. Unfortunately, any time we make any changes that we want to see immediately, we have to repeat this process. That includes to discount codes, events, memberships, contributions, etc. It's annoying and hopefully if enough people are also experiencing it and report the problem we can get a permanent resolution.