tacx neo 2t slope hard on bkool

Hello I have a tacx neo 2t and I use the bkool application but I have a slope problem that I do not have on other applications for example on bkool in a slope at 8% the difficulty and well above it feels like a 10 to 11% slope instead and I have the right weight I have the home trainer up to date and the software also have you having this problem?