What foundryVTT version are you running and does it still happen if you disable all other modules?
Lastly could you open your browser’s dev console (F12 > console tab) and reproduce the bug. Then screenshot any error logs that show up.
I think this might be related to you having a version of the module higher than you should be able to. It’s something I fixed now, but there was a window where you could install the Foundry v13 version of Terminal in Foundry v12.
If I’m right on this then you will need to just uninstall and reinstall the module. This is completely safe to do.
When you reinstall it should download 3.2.6 for you. Let me know if that fixes the issue for you.