The number is outside the range the command accepts. What the printer does with it varies by model: clamp, ignore or misprint.
^XA^FO50,50^A0N,99999^FDHELLO^FS^XZFinding: ZPL3002 · line 1:12 — ^A0 parameter 'h' is 99999, outside the valid range 10–32000
Open the broken label in the editor →
Use a value inside the range given in the message; the command page lists every parameter's range.
^XA^FO50,50^A0N,40^FDHELLO^FS^XZOpen the corrected label in the editor
ZPL3001 Parameter is not a number
npx labelixa validate "labels/**/*.zpl" lints your files and prints this page's address next to each finding. /docs/cli