Dropdown menu for Smart animate, does not ease in and out nicely, for subsequence columns

I have a problem with my smart animate, ease in and out. I have a drop down menu with 10 expandable list, the first 2 columns transit in and out nicely, but the 3rd column down does not appear the same, it flashes and in an instant changed to expanded mode (not transitioning smoothly).

Please help me with this issue. Appreciate it.

Thank you

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