here a thing, every graphics card, and to an extent motherboard has a hidden graphics output order for legacy reasons.
usually in this order:
- old analogue output (s-video, scart, composite etc)
- dp or hdmi.
because you're using two very old monitor and only have analogue input, the system will assume you're only connecting to a digital only display device. in this case, your two vga to digital adapter. and the thing about dp and hdmi is, display device will return infos about their properties, like refresh rate, colour gamut etc.
in this case im pretty sure its your adapters' fault, there's nothing you can do other than get rid of your e-waste monitors and get newer ones.