Dropdowns doesn't open entirely

Description

Hi, dropdowns only display one or two options, it's very difficult to use them. I found this bug when adding languages to a group, tested on firefox and chrome latest version.
A screencast to see this behavior : https://wp-translations.pro/site/wp-content/uploads/2018/05/Screencast_24-05-2018_12:13:42.webm

Thanks

Environment

None

Status

Assignee

Kathryn Gough

Reporter

Jerome Sadler

Labels

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Tested Version/s

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Sprint

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Fix versions

Affects versions

Priority

High
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