I second that, to the extent that to this colourblind person, Liberty and Weaver look the same, and Suffragette and Windrush look the same.
It's very poor design, you need something other that colour to distinguish between line (the equivalent of putting a different marker on series on a line graph).
For the most part the colours seem to have been chosen to make them easily distinguishable from Tube lines of the same or similar colour, meeting at right angles if at all.
Lioness - (yellow). Not-quite-meets the Circle at Euston. Yellow-and-brown alongside each other for much of its length.
Mildmay - (blue). Crosses the Piccadilly near South Acton, West Brompton, and in Islington Barnsbury, which is a bit of a blue tangle because the Victoria Libne is also in the area.
Windrush - (red) - crosses the Central Line near Shoreditch
Weaver - (maroon) Meets the Met at Liverpool Street
Suffragette - (green) Crosses the Ditsrict at Barking
Liberty - (grey) nowhere near any other line except Elizabeth and District
There is though an unholy mess around Stratford, with the Mildmay, DLR and Elizabeth Lines all in blue-ish open lines.
Also, on my screen, the Emerson - sorry, Liberty - Line looks like a branch of the Elizabeth Line.