A: Different operating systems use different rendering engines (DirectWrite on Windows vs. Core Text on Mac vs. FreeType on Android). The font shape is the same, but the "hinting" (how pixels are aligned) varies slightly.
Microsoft Word has an auto-format feature. Select all text (Ctrl+A), set font to Un Samantha, then go to File > Options > Proofing > AutoCorrect Options > AutoFormat As You Type > Uncheck "Automatically define styles." un samantha sinhala font download
Using Sinhala fonts often requires a specific input method or "keyboard" layout. set font to Un Samantha