Errors in Category Tree List Display

Hi Mr Dam
I am using a Category Tree List on my site and it was working well and showing the categories and subcategories. However, the folders in an unopened category are not showing the correctly: see attached screenshot
Do you know why this might be?
Thank you
Miles
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The images of the sub-categories re-appear after one clicks on a category and then one of its sub-categories

Hi Miles,
With this kind of issue, i advise you to click on menu: Support Tickets at the top and submit new ticket on category: Edocman, then, please provide your site url with super admin account. I will figure the problem for you.
Thanks
Dam

thank you Mr Dam: a ticket has been created

Hi Miles,
I have answered you through Ticket system
Thanks
Dam