Elli sorry I didnt get back to this.
As Dee explained, it could be a lot of things, but it means we arent getting enough energy in the right place to disable the follicle and release the hair. This can be for a lot of reason including :
The machine not operating correctly, or not producing current This commonly happens when probeholder wires go bad.If you’ve bought the machine used, have you tested it?
Insertions must be accurate…The energy has to be in the right place to destroy the lower 1/3 of the follicle completely. Use of an insulated probe keeps all the energy release in the same area, but you have to align that part of the probe with the lower 1/3 .
The energy settings may be insufficient to effect the release of the hair, thus the hair breaks when you go to tweeze it.
Finally, we dont know even what modality you are working in. If its blend is lye being created? Is there a lye crust buildup on the probe?
It means quite a bit of troubleshooting, including doing a bubble test to check galvanic, a egg white test to test thermolysis , possibly swapping probeholders, and then fiinally having a good long look at your technique.
And finally, I feel like an old grandma saying this, please dont do thermolysis alone as DIY on your own face. It’s not going to end well for you.