Wierd display in debug pane (no styles ?)

Hi,

We're running 1.0.1 and somewhat the debug pane looks like missing some styling.

There are not Javascript errors nor Network errors in the developer tools (F12)...

Any idea what could cause this ?

maybe something is overwriting one of the styles ? maybe a browser caching issue ?

Tried many browsers, private sessions, checked debugger tools, no network or JS errors....

This is a snapshot of the debugger tools. The machine node-red runs on does not have internet access, for security reasons. Not sure if this is the cause of the issue.