I sometimes play that way on songs that aren't pushing me too hard[2]. If the part's at all tricky for where I'm at, my dynamics are all over the place. I know part of this is practice, but I'm pretty sure there's some technique I'm missing, or some ways I could practice that would be more effective.
I have the least bass experience of our bass players, and less time on instrument than almost anyone else on the team.[1] I don't count time playing guitar because I never got past "decent player", and that was years ago.
Everyone else seems happy enough with my playing, but I'm not. I'm not beating myself up; I just want to see real progress.
[1] I play at church, and we mix and match each week's team from our pool of musicians. We have at least 2-3 people each for bass, drums, electric guitar, acoustic guitar, synth, piano, and vocals. Only one violinist; no other bowed instruments- yet. Several really good sound peeps. I'm pretty blown away by how many amazing worship musicians we have for a church our size. I'm thrilled and honored to get to play with them. My favorite part? Each of us brings what we bring. So any given song may not sound anything like the way someone else plays it. I can bring in a part influenced by anyone I like, or just make one up. Only three times in ~5 years was I asked to play a specific part, and I play at least 40-50 ~45-60 minute sets a year between Sundays and special events.
[2] (This has probably been here before. Oh, well.[3] But the bass player gets camera time, probably because someone was confused.)
[3] I was tempted to link a Fleetwood Mac video, but won't for now.