For flight modes LP uses a 1-based counting system. That's how normal humans think, where '1' is 'first' and '0' is 'none.'
LP doesn't know or care what radio system anyone uses.
Taranis in their obvious brilliance
apparently uses a 'programmer oriented' 0-based system where '0' is 'first.'
Taranis doesn't know or care what GCS anyone uses.
The 'first' mode in the Tx is 'FM0.'
The 'first' mode in LP is 'Pos. 1.'
The 0-5 in Taranis correspond to the 1-6 in LP. Learn to deal with it.