Certain Spanish words erased on signs

I try to write on a sign the word canalización I which is (book of enchantments channeling I) in Spanish

The words are erased, it also happens with a Toque de seda l (silk touch) but this if it works less in white (§f) The problem is that it happens with many words or phrases that are not bad words This happens in the Realms.

I asked in forums and social networks and several have the same problem thanks