You need to check your Taranis settings.
You can set up the standard 1~4 channels in any order.
AETR is typical standard but your description sounds like you have it set up as EATR
I think you will find this in the model settings first page or perhaps the Taranis settings page.
Also whilst on the topic of the Taranis and SBUS, you should be aware that it puts out hot levels on the X8R (SBUS).
By that I mean when compared to my Futaba 10C paired with an FrSky TFR8 (SBUS) the Taranis/X8R combo at full throw seems to go way past 100%.
I discovered this by a different FC I use treating this as an illegal signal and forcing a RTH event. To fix it I had to dial ch1~4 sticks back to about 88%.
Just something to be aware of