Deleting first sentence in lesson is not working

I created this lesson by pasting in the text of a news article, and I pasted the first sentence into the title box, not noticing that it was too long and got truncated.

After it imported, I saw the title was truncated, so I changed the title to English and it fit.

But apparently the title was captured as the first sentence in the lesson, although it is just a broken version of the actual first sentence of the article, which is now the second sentence of the lesson.

I edited that first sentence and pushed the trash can icon to its right, thinking that would delete it, but it has not done so.

So I am reporting this as I wonder if that trash can icon might be broken.

Lesson url: Inicia sesión - LingQ

I will attach a screenshot showing the trash can icon I clicked, thinking it should delete the sentence.

Note: When that failed to work, I tried going to the whole lesson editor to try to remove the broken part from the top of it, but it is not listed in the whole lesson text–which I guess makes sense, as that broken sentence was never part of the lesson text in the first place–it was apparently generated by the import software from the title box.

Thanks, I was able to reproduce the problem too. We will look into this.