Mould Tool Distorts Letters

[mokusbajusz]

Hello,

since the initial thread starter question seems to be solved, and I do not want to make a new thread I add my question here.
Mods or admins please make it as a new thread if you think putting it here is unwanted.

My problem: I have added the mold feature to a text line and the upper parts of letters (where actually the mold effective) became distorted (see attachment).

Is there a way to avoid it?

Thanks in advance