But as I’m not a developer myself and simply managing the GitLab instance updating then I’m not sure where else to go with this problem.
Does anyone know how to resolve this?
Can you please explain exactly where in the web interface this is happening? Best would be to explain what you have clicked after selecting a repository. I use latest Gitlab 17.3.x and I have no such problem when I click and open my repositories and so am unable to replicate your problem.