I just purchased a 200$ startech Dual DisplayPort for my M1 Mac mini (on Monterey last version) because I own two 4K dell that only have display port (it also has hdmi 1 but it will only support 30hz and it's really horrible to work with such a refresh rate).
And I have the same problem as the other used on this thread, it will support 2560x1440, but only in "low resolution" which again looks really bad...
These screens work just fine if I use them one by one using a on 2560x1440, so I don't understand why this is an issue... It seems to support all of the other resolutions in both low and high resolution, only this one is not listed...
I hope something can be done about this because 200$ for a huge UI or letters so small I can't read anything is a bit much
And I only have like 10 days to return it...