Submenu of dropdown pointing demo often displays wrongly

[danwdart]

Bug Report

Submenu of dropdown pointing demo half the time displays "under", and then redoing it displays "over", alternating behaviour.

Steps

Click dropdown on this section of the demo page.

Expected Result

all of the time

Actual Result

every other time.

Version

Whichever version the website using currently? Unsure

Testcase

https://react.semantic-ui.com/modules/dropdown/#types-pointing

Firefox 91.0.1

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