SCheck the "Events" link on the device page or the past (or live) logs (if you have this enabled). You're likely experiencing the problem where the button itself incorrectly sends multiple pushes, which is a known problem for some users of these buttons, particularly in early firmware. This thread and this post in particular is one place you can read more: "New" SmartThings 2018 sensors
To work around this, the driver in the post linked to above may work. If you have an ST hub, temporarily paring the button to that and allowing the firmware to update may also resolve the underlying problem. (No need to remove it from Hubitat; just leave it and reset the button to switch between hubs as they are put in pairing mode. That way, your Hubitat automations stay intact.)
Of course, it could also be another problem as mentioned above. The logs or events will help narrow it down. But it sounds a lot like the issue above.
