system
A chat on subreddit /r/wallstreetbets
human
uhh wtf? my collateral is always the strike width.  
  
 your max loss here is 100 - 35 = 65 but they should have taken 100 in collateral

gpt
Yeah so I noticed collaterals on RH fluctuate quite a lot. I bought another credit spread of the same strike and it took $38 collateral but now it's asking for $100. 
  
 Edit: Thank you for answering my max loss question! :)