Double webcam feed display in `video-config`

[becky-gilbert]

Describe the bug

In the video-config frame, sometimes the webcam feed displays twice on the page: once where it is supposed to be, and again directly below that webcam feed container. The additional display appears on top of the text below the correctly-displayed webcam feed box (note about browser/device compatibility), thus covering it up, but the reload button and device selection elements are displayed on top of the additional webcam feed.

Which frame or frames does it affect?

video-config

Example

https://childrenhelpingscience.com/exp/studies/3917/

• Version of frameplayer code (last_known_player_sha field on the study edit page): 6ce2364903c24b1fc00d2fbc950a482d21b899b9

https://childrenhelpingscience.com/exp/studies/3890/

• Version of frameplayer code (last_known_player_sha field on the study edit page): afb2fda97f9325476da70e2bc0e4602816011c60

Environment

• Lookit environment: production
• Operating system [e.g. Windows, Mac, Linux]: ???
• Browser [e.g. Chrome, Firefox, Safari] and version: ???

[becky-gilbert]

cc @msheskin

[msheskin]

In case another example is useful, happened again when admin reviewing https://childrenhelpingscience.com/exp/studies/3890/