Is there a bug with half-life (non) progression?

I have been using LR to learn German daily for about a month now. After 4,171 repetitions for 68 “Learning now” words, the highest half-life achieved is only 0.79.

0.79?? Not even a day??

Is this normal or a bug?

I have used spaced repetition systems for 20 years and it looks crazy low to me after so many repetitions.