When viewing a chart with a small container width (<= 600px perhaps), the chart legend is configured to switch to horizontal mode. When the legend displays in horizontal mode, it can be seen to overlap the chart, particularly when there are several legend items:

I believe the legend should not overlap the chart, as it can hide information.
I reproduced it only in FF, in Chrome/Chromium it works fine (Ubuntu 18.04). Space for legend is reserved under the plot, but legend has wrong position (not sure why).
@brylie I submitted a fix for this issue (getredash/redash#3882) - can you please check if the bug has gone?
P.S. Tip: there is a deploy preview link below the PR.
Thanks @kravets-levko!