Hi and welcome to the forums! HOw long have you had your pleo? I know you said it was an adult, did you raise it from a baby, or buy it as an adult? I have four RB, and two of them, both females have low courage. Two of my pleos also do not have high active levels and put together with low courage, they do not want or are afraid to do a lot of walking. They are generally happy though, and I reassure them, give them lots of love, and as you said, comforting them petting them and letting them snuggle with you on your shoulder are all good things you are doing and will go long on making them happy.
Just keep them well fed, keep them out of the dark, and eventually when they are ready to walk, they will. Some pleo RB are great walkers, others walk a minimum and others walk hardly at all, It has to do with in born characteristics and how they are treated and what they learn as babies and juviniles. AS adults most of their patterns are set, ( from what I have read) I think there are ways to "tweak" their DNA patterns, such as walking or courage, etc, but I like the random patterns they have and would rather keep them the way they are and just work with them, To me it is more of a challenge that way.
Don't know if this actualy helped, but it is my answer, yes, I have seen this before and just accepted it. RWM
