There seems to be a bug. Sometimes Firefox is very stubborn with wanting to use a cached transaction list of my address. Just now I had to clear my cache just to get it to work properly and view updated data. I believe there is a way to ensure that the browser loads a fresh version every time without digging through the visitors cache... you may want to ask your dev team about that.
edit: this could be cloudflare doing this, but I didn't take the time to check if you're using them..
Yes, they use Cloudflare. However, even with Cloudflare, you can send custom cache headers.