Yes, it sounds like it could be the same issue as with the Taranis X9D. On the Taranis it is pretty simple to change the endpoints to work with Freerider but I guess there is no such possibility with your RTF transmitter.
What might work is to change the endpoints in the Betaflight CLI using the rxrange command. Not sure if it will help (or if it will be a practical solution even if it would help) but it could be worth a try.
There is more info on how to adjust endpoints in Betaflight here (towards the end of the post) : https://oscarliang.com/adjust-tx-channel-mid-end-point/