Check the valid heart rate ranges.
According to Maxim's "Measuring blood pressure, Heart rate, and SpO2 using MAX32664D - A quick start guide" UG6921; Rev 1; 9/19 in table 4 "Format of received sample - BPT algorithm" heart rate is represented as 2-byte MSB first value representing x10 heart rate. It is not clear if the range is limited in any way. It is also not clear if the value is an int16_t or uint16_t.