Ram Connection Fillet Weld and Full Penetration

Hi. I'm still learning using RAM Connection Standalone and design connection. So I have a question regarding end plate welding (designed using EN 1993).

When I use weld size 4mm, there's check for "Top fillet weld transverse force resistance" and "Bottom fillet weld transverse force resistance", thus connection critical ratio failed.

But when I use weld size 6mm++, there's NO check for "Top fillet weld transverse force resistance" and "Bottom fillet weld transverse force resistance", so connection critical ratio is okay.

Why is that? Plus, result is still the same even though I used Full Penetration weld. That reference for "Top fillet weld transverse force resistance" and "Bottom fillet weld transverse force resistance" is from where?