# Problem with two linked dropdown

**URL:** <https://forum.adalo.com/t/problem-with-two-linked-dropdown/17557>\
**Category:** External Collections, Custom Actions & Collections\
**Created:** [September 22, 2021, 10:52am UTC](https://forum.adalo.com/t/problem-with-two-linked-dropdown/17557 "2021-09-22T10:52:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![FabioAdaloC](https://avatars.discourse-cdn.com/v4/letter/f/0ea827/32.png) [@FabioAdaloC](https://forum.adalo.com/u/FabioAdaloC)\
**Post date:** [September 22, 2021, 10:52am UTC](https://forum.adalo.com/t/problem-with-two-linked-dropdown/17557/1 "2021-09-22T10:52:19Z")

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Hi,  
like i said in the title, i have this two dropdown to chose a category and a subcategory.  
I use an external collection to get the records and i have tested the endpoint for long time so, i’m sure that the set of results is correct.

For the subcategory i pass the param to get the filtered list but when i test it in the preview the subcategory only show the same result for each item received.  
(Es. i chose a category with 3 different subcategories x,y,z and the dropdown have 3 x )

After that when i change category, the dropdown with sub append to the previous set the new set.  
(Es. i chose a new category with 5 different subcategories a,b,c,d,f and the sub dropdown have the 3 x plus the 5 new subcategories).  
Any suggestion? has anyone been in my situation? is this a bug of the component?

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**Author:** ![Yongki](https://avatars.discourse-cdn.com/v4/letter/y/7c8e57/32.png) [@Yongki](https://forum.adalo.com/u/Yongki)\
**Post date:** [September 22, 2021, 12:03pm UTC](https://forum.adalo.com/t/problem-with-two-linked-dropdown/17557/2 "2021-09-22T12:03:41Z")

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Hi @FabioAdaloC ,

I rarely use dropdown, but you can find more information about their behaviour here,

> [@How to use the same dropdown with different filters?](https://forum.adalo.com/t/how-to-use-the-same-dropdown-with-different-filters/10649/7):
>
> Hi @axme , I have replicated your issue. first, I can’t find how to reset dropdown to be select, it may have something to do with browser’s cache second, if dropdown=select, then its value comes from cache, so it is better to make variant=“none” for every variant id (I have not implemented this) Here is the rundown, Here is the variants collection [Screen Shot 2021-03-26 at 9.02.37 AM] Menu master collection, Order …

For current unselected issue, you can find the replacement here,

> [@Dropdown Always Shows a Value](https://forum.adalo.com/t/dropdown-always-shows-a-value/17176/7):
>
> Hi All, I have made modification, not using button anymore. If you can’t wait for the fix, this workaround may solve.