Looks like you are playing a mix of the 2024 e5 edition and Tasha's Cauldron of Everything, whitch might explain the discrepency.

Hexblade Subclass is not part of the base e5 Legacy rule book I used to add the subclasses.

The project is open source, so feel free to make a PR with additions or create an issue to request changes: https://github.com/adamlamaa/dnd-spells

Well looks like it's a mix of reasons.

Firstly, many of your spells seem to be from the revised e5 2024 edition, where as the website currently only supports the e5 legacy spells. Secondly, two of the spells you mention where apparently just missing from the source data set I used. I have added Mind Sliver and Armor of Agathys

Thank you. It’s written in Typescript using React and Nextjs. It’s a pretty simple solution kept the spells in a json file, so there is not even a database for the main logic.

Yeah, if it does not fit on one card, i add follow up card. When I was building it I was like it's find to have a "back" card. But some spells get pretty long.... I formatted it all manually by splitting the description.