I have same/similar issues: I just started on 25 Dec. When I get the free Great Pachinko try/spin, I can select the three banners on the left, (they shift to the left when I click on them), but it does not change the larger description on the right. It stays as Great Pachinko. It is also the only time I can buy x10 tries for Great Pachinko. When I leave the page, and return later, I can select the three banners on the left, same as with the Great Pachinko, during the free try/spin. However, the large description on the right is stuck on Event Pachinko. I can only click on the 4 games for 1800 Kobans. This means that for the last three days, I have not even seen what the large description is, for Epic Pachinko. I do not even know the options, or cost of Epic Pachinko.
For info: I am playing on PC, Win10, and IE. I do have Norton Security, and adblockers. This happens on the two accounts I have. I disabled the adblockers, and it did not fix it. I have had both accounts open, and have closed them, and only had one or the other open. The first account I have was from ThriXXX, it has a ThriXXX menu bar at the top. I found the game from that sight. Then I noticed on the ThriXXX launcher, there was a banner/ad for HH, and I clicked it. It started the game from the start. Out of curiosity, I played it, and realized that it is the same game, but different URL's. There are some differences in available options. Like having a link to the Forums in the drop down menu, and full screen mode.
Basically this is not a one off issue, since Loghan and I both have similar issues. Any advise/Help would be appreciated.