I've encountered various problems with Safari over the years and have pretty much given up on using Safari for church systems. Your best bet would be to submit Feedback (use the Feedback link at the bottom of nearly ever page) and provide specific feedback about the problem you're encountering. You can't include pictures, so if pictures are important to communicating what's wrong, you can make a post here and include a link to it in your feedback.
Note that submitting feedback doesn't mean the problem will be fixed, but it does eventually get routed to the decision makers. I believe the people who answer the initial feedback may be volunteers and may not be that familiar with the problem you're encountering. In general, the first response you get is to clear your browser cache and cookies, so do that first to verify that clearing the browser cache and cookies doesn't fix the problem...and tell them you've already done that and the problem persists. You may need to restate the problem a few times for the people to understand the problem. You won't know it, but your issue may get passed off from the volunteer to the actual people working on your issue and they could interact with you more regarding the problem.
