This is a known bug. As a workaround you can reset the Italic attribute by turning off the setting, then clicking on one of the capitalisation buttons to ensure it is applied to the text:
(Take note of your capitalisation first so you can set it back after pressing the button!)
HTH Jeremy
A fix for this will be available in release 8.29. Thanks for bringing it up.
RH-92290 is fixed in Rhino 8 Service Release 29
