Category listing with direct sub categories bug

The bug is found on this page:
air-smartz.asia/demo/airobotics

Problem 1
I click on say "S-Series" to open the panel to show its sub categories. Then I click on the sub category "Trial Class Project". When I reach the page, the panel is closed instead of opened like what I see on Hikashop demo site.

Problem 2
When I click on "Event Series" under Workshop, followed by "Lantern Festival", the active highlighted tab becomes something else instead of "Event Series". I would also like the panel to remain opened like what I see on Hikashop demo site.

Joomla version: 2.5.6
Hikashop: 1.5.8 (business)

Kindly please help.

Thank you for solving problem 1.

However the 2nd problem remains. When I click on "Event Series" under Workshop, followed by "Lantern Festival", the active highlighted tab becomes something else instead of "Event Series". It only happens to the categories found inside the "Workshop" box. As you can see, the categories found inside the "Workshop" box belong to a different parent category from that of the ones found inside "Age Group" box. For this feature to work properly, am I allowed to display more than 1 hikashop_content_module on the same page?

I had sent you the backend access via the contact form yesterday. Have you received it?

Since it is a limitation posed by Joomla itself, then it can't be help. I shall take your recommendation not to have more than one pane on each page.

Thanks for your help.