Warlock (Legacy) Level Features not Registering on Homebrew

I was working on a Warlock and had the features for levels 1, 6, 10, and 14... but the system says those are wrong? I've double and triple checked that those are the correct levels, but DND Beyond still claims they are incorrect. I've also confirmed that I'm working with a 2014 Warlock, and that I'm not accidentally making a 5.5e Warlock.

I also grabbed a Warlock I had made that was previously approved by DND Beyond and updated it, only to now show it is also out of alignment with the levels, so I'm certain something is broken with the back-end. Could a recent update have confused the 2024 and 2014 level requirements?

This is something that they inexplicably break every few months or so. It's not really clear why, but every so often, this thing stops working and throws up false errors on subclass feature levels.

When this has happened in the past, it's sometimes been helpful to add dummy features at the levels expected for the other version of the class (so, in your case, a level 3 feature) as a workaround. Other times, this hasn't helped and it hasn't been possible to work around it until they fix it.