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Seems fine in the online sandbox. (Chrome 79.0.3945.117)

I don't need a refund; This seems to work fine on my other machines (Windows and Linux) and my Mac is supposed to be for work anyway. :-)

After a little more investigation, it doesn't appear to be a problem of hitbox size, but there is definitely something going on that makes me have to try clicking at least 3-5 times before an action is taken. It may be sensitive to click, drag (deliberate or inadvertent drag), and release timing or something, but it makes it very difficult and almost unusable on this platform.