If it's Helvetica you could try to change it to arial for example.
That has solved this kind of a problem in AC21 sometimes. Or start over if it doesn't help, it might go away with boot. It's an annoying problem not present all the time.
AC25, Rhino6/7+Grasshopper, TwinMotion • Mac Pro 6,1 E5-1650v2-3,5GHz/128GB/eGPU:6800XT/11.6.5 • HP Z4/Xeon W-2195/256GB/RX6800XT/W10ProWS