What steps will reproduce the problem?
1. In a CL, Click on 'CHOOSE TRYBJOBS' link.
2. Type in 'um_rel_ng' into the search box.
3. Choose 'Linux_chromium_rel_ng' and 'win7_chromium_rel_ng'.
4. Clear the search box.

What is the expected output?
Just 2 trybots would be selected.

What do you see instead?
4 trybots are selected. The above mentioned plus 'android-binary-size' and 'android-marshmallow-arm64-rel'.

Please provide any additional information below.
It seems that besides the actually selected items, items from the full list with the same index are also selected.