Instance Custom themes are broken

Hello I just noticed that the custom theme options in the user settings seem to not apply correctly when I select them, when selecting any one of the custom themes available here the page becomes very buggy

Not sure if this is related to the 0.19 upgrade or not but I wanted to make this post so hopefully it can be fixed.

Tagging admins so they see it:
@QuentinCallaghan@sopuli.xyz
@Moxvallix@sopuli.xyz

Edit: The themes which are broken are:

• darkspace
• lora-compact
• lora-distractionless
• lora -mintybubble
• winternord