Not entirely sure of the root cause here - it seems like we tripped on a change in Chrome 71 (and maybe earlier in Firefox based on @Hamms' reports).  But we consistently saw this problem with extreme page width/height when these tooltips are rendered inside an element with a `transform: rotate(xdeg)` style.

To solve, I've added an extra wrapper div around progress bubbles and placed the tooltip outside of the rotated content.  Verified within storybook where we had a really easy min-repro.  This may have subtly changed the tooltip height, checking that out now.