# List.Map not behaving. List count mismatch?

**URL:** <https://forum.dynamobim.com/t/list-map-not-behaving-list-count-mismatch/41313>\
**Category:** Uncategorized\
**Tags:** dynamo, bimorph\
**Created:** [October 1, 2019, 6:00pm UTC](https://forum.dynamobim.com/t/list-map-not-behaving-list-count-mismatch/41313 "2019-10-01T18:00:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![kmulase](https://avatars.discourse-cdn.com/v4/letter/k/c57346/32.png) [@kmulase](https://forum.dynamobim.com/u/kmulase)\
**Post date:** [October 1, 2019, 6:00pm UTC](https://forum.dynamobim.com/t/list-map-not-behaving-list-count-mismatch/41313/1 "2019-10-01T18:00:06Z")

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So I’ve got one that I can’t get my head wrapped around: I’m using List.Map to apply a BiMorph node to collect clashes. Seems simple enough, and I’ve used similar graphs successfully in the past. I have 200 items in the input list, but I’m only getting 199 items in the output list. I’ve never had this happen.

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/5/b/5b38f848dde9da3c20846afb50e4eda340b4e4d6.png)  
List map with item counts