CX's website is indeed full of bugs lately. Like many posters have already mentioned, I also got that nasty loop of javascript validation. I tried different browsers and different laptops, nothing works. finally i had to call them and make the booking over the phone.

Then I went to manage my booking. First it mentioned CX360 was operated with A333, then I selected my seat but I noticed the J class is 2-3-2. A couple of days later, MMB showed CX360 was operated with 773. Then it changed again to 772 with 2-3-2 arrangement. Two days ago, I went to MMB again and found that my seat reservation was gone and that the system cannot retrieve my booking. Today, I found that CX360 is now operated with 77H. I need to mention that it still shows 772 as operating aircraft. Only the seatmap shows 77H

It feels like playing musical chair lol