Chord labels for very small chords inconsistently sized/layered

Latest version of Google Chrome, Windows 10.

Very compressed chords have labels that are very small and difficult to see. In addition, the chord symbols, while playing, flicker at about twice per second. After the YouTube video playback, some chord symbols are visible without zooming in, but they are large enough to be layered on top/below other chords.

Using June 1st Tab of the Day as an example.
Before playing:

After playing: