My Page has always been a little funky. Sometimes it won't display registered packs or worlds. No reason other than it just glitches. There's nothing you can do on your end. You can try contacting EA help through the Origin website but it's not a promise they will help.
Don't take this the wrong way but this is more of a cosmetic issue... Not really a concern as long as you can download & install + play those worlds like normal. Years ago I contacted them about Supernatural not showing up on My Page. They ended up removing it from my account and giving me a new code to register which was kind of a pain to reach that point. Not exactly worth it, in my opinion, looking back.