It looks to me like Yakihonne and Jumble have been showing fewer notifications coming through lately. Sometimes I miss seeing certain comments or other reactions to my notes. It can't be because of my used relays, since that's the same across all clients. As a comparison, I can see everything that comes in when I use Amethyst.
Discussion
Jumble only looks for notifications from your read relays. If someone mentions you but their client doesn't send the event to any of those relays, you won't see it.