That is color formatting code, it’s what gives text their color :). It wasn’t supposed to be there because options do not support color, so that text is probably in the wrong place :P.
I got 1 Parasite work in leah and progression 100% I couldn't know what to do so I took the anti parasite and tried it with wharf roach egg bee giant slug and egg fly but the eggs weren't coming ?
Check the update devlog for version 1.30, everything should be explained there :). Long story short, eggs only hatch outside and Parasite Worm triggers the Big Worm scene instead of hatching.