Hi,
I am also having the exact same problem, where all the other meta fields fail to have their values display in the admin when the Term Meta extension is installed. As soon as it is uninstalled, the issue is resolved.
I am using Meta Box Version 4.15.1 and MB Term Meta Version 1.2.2 on WordPress 4.9.7. This is the first time I have used the Term extension, but I have been using Meta Box for the last 2 years without any issues.
Here is my meta box code:
https://ghostbin.com/paste/pr33f