Your model doesn’t pass the model checking due to Text Curves from Squid. The component doesn’t work reliably with some fonts so here is an alternative solution for you. First, convert the font you use to meshes with MeshGrammarMaker.ghx. Then internalise the result and use it as input for MeshGrammarConverter.ghx (454.5 KB) which will replace the Squid components in your main definition.
This is also more efficient than generating curves from text every time the model runs. Let me know if this works for you.