I am experiencing strange issues with fitting the basic cosmological model using Montepython and Planck2018.

[bingchen11]

I'm having an issue while using Montepython to fit the original model in CLASS. When fitting the inflation model with only 6 cosmological parameters, the results are quite strange. The value of H0 is around 0.5, which is unexpected. I haven't made any changes to the other codes, and I've encountered this problem with both CLASS versions 2.7 and 3.1. I would greatly appreciate any assistance from someone who can help me with this.

use by Planck2018 data and add cosmo parameter tensor-scalar ratio r
result

[brinckmann]

Dear user,
Your are raising issues on the old MontePython v1 and v2 repository (active in 2013-2018).
As clearly stated on this wiki, issue #55: since April 2018 and v3, the MontePython repository has moved to https://github.com/brinckmann/montepython_public
Please go there to clone a recent, working and maintained version of the code. Then, if necessary, please raise your issues in that repository.
(In this particular case, the nuisance parameter list should go after the cosmological parameters and before the derived parameters)
Best,
Thejs