The file bme69x_defs.h defines BME69X_RUN_GAS as 6, but this appears inconsistent with BME69X_RUN_GAS_POS which is defined as 5, and also inconsistent with the datasheet. Also this whole set of definitions appears to be unused and redundant.
/* / * BME690 Heater Off Bit Position * / */
#define BME69X_HCTRL (3)
/* / * BME690 Run Gas Bit Position * / */
#define BME69X_RUN_GAS (6)
/* / * BME690 nb_Conv Bit Position * / */
#define BME69X_NBCONV (3)
The file bme69x_defs.h defines BME69X_RUN_GAS as 6, but this appears inconsistent with BME69X_RUN_GAS_POS which is defined as 5, and also inconsistent with the datasheet. Also this whole set of definitions appears to be unused and redundant.