Garmin BP707

I have a Garmin BP707 and Omron M-10IT blood pressure monitor. I bought the Garmin because of its portability and the ability to connect to Garmin Connect, i.e., sharing values with the Fenix 8 watch. However, it seems to me that the Garmin BP707 gives very different results compared to the Omron, and sometimes the values seem rather random to me, because my blood pressure never fluctuated that much according to the Omron. Are there any other sources that confirm my impression?