Here's how it looks on my phone:

As you can see, the layout breaks as soon as a caption includes a longer word (because there's not enough horizontal space). I don't think it's possible to fix this for all numbers, but there are some small improvements we could make:

• Reduce left/right margins
• If there's not enough space, only show the ellipsis and hide all other icons in there
• Check if CSS can be adjusted so words break in the middle of the word
• For very long notations, we could also move the caption into the popover and only show the notation part and the ellipsis

This obviously has a very low priority, but it can't hurt to have it as an issue.