How to let menu open to active li?

the parent Ways to Bank is set to Articles » Single Article but the child is an Alias (in the side menu)

Also we just changed the URL cuz there was a typo in it. so it changed to earlgreycu.now-hosting.com/index.php/banking/ways-to-bank

ok, but you have not replied to this

Can you publish a native joomla menu module to show the same menu and tell me, so that I can see if the class is applied

Oh sorry. I was so wrapped up in my work yesterday, I kinda forgot that part. I just did now.

you can see that on the native menu there is also not the active class on the element and the parent.
this is a problem from your menu structure that is not correct, when fixed the menu accordeon will work correctly

Mmmm how should I structure it then?

Right now, the main menu structure is this:

(i'm just gonna do the banking as the full thing is big)

level 1 is only visible on the top main menu
level 2 is visible on both side accordeon and top menus
level 3 is only visible on side accordeon menu

Banking (Text Separator)

- Ways To Bank (Articles » Single Article)
- - Ways To Bank (menu alias that points to parent Ways to Bank since in the accordeon we cant click on parent)
- - In branch (Articles » Single Article)
- - Online Banking (Articles » Single Article)
- - Mobile Banking (Articles » Single Article)
- - Credit Union Connect (Articles » Single Article)
- - Electronic Statements (Articles » Single Article)
- - ATM (Articles » Single Article)
- - ding free® ATM's (Articles » Single Article)
- - Telephone Banking (Articles » Single Article)
- - Hyper Wallet™ (Articles » Single Article)
- - Night Depository (Articles » Single Article)

- Chequing Account Options (Articles » Single Article)
- - Chequing Account Options (menu alias that points to parent Chequing Account Options since in the accordeon we cant click on parent)
- - Personal Chequing (Articles » Single Article)
- - Business Chequing (Articles » Single Article)
- - Youth Chequing (Articles » Single Article)
- - Non-Profit Organization Chequing (Articles » Single Article)
- - Student Chequing (Articles » Single Article)

- Card Products (Articles » Single Article)
- - Card Products (menu alias that points to parent Card Products since in the accordeon we cant click on parent)
- - Member Debit Card (Articles » Single Article)
- - Credit Union MasterCard Credit Card (Articles » Single Article)
- - Travel Notification (Articles » Single Article)
- - Lost or Stolen Cards (Articles » Single Article)
- - Global Payment Master Card (Articles » Single Article)

- Additional Services (Articles » Single Article)
- - Additional Services (menu alias that points to parent Additional Services since in the accordeon we cant click on parent)
- - Safety Deposit Boxes (Articles » Single Article)
- - Certified Cheques (Articles » Single Article)
- - Foreign Currency (Articles » Single Article)
- - Traveller's Cheques (Articles » Single Article)
- - US Bank Drafts (Articles » Single Article)
- - Wire Transfers (Articles » Single Article)
- - Bill Payments (Articles » Single Article)

I can not answer this, this is a feature from joomla. You can see that you have the same issue with the native joomla menu module. Try to ask on the forum.joomla.org to see if someone can help you with this