Editing text in SO10 shows random numbers instead of texts

I was trying to edit a specific a standard text in a specific window using SO10.

INCLUDE Z_XXX_SAMPLE_ITALY OBJECT TEXT ID ST

Steps done:

SO10

Input Z_XXX_SAMPLE_ITALY chose ST; EN as language

Click change

But it is showing numbers like this when editing

4F54465269756D61FFFFFFFF0100000000001685000007GD000004B1000001AB012C000100000000FCF054455854202020202020535420205A5F4C4F474F5G555053

Is the INCLUDE Z_XXX_SAMPLE_ITALY OBJECT TEXT ID ST editable?