Question: Disconnect in a curve??

I adopted the approach suggested in an earlier post (

/questions/137320-Plotting-A-System-Of-Ode) for the known results,

but some part of curve is missing.

The output I got is

and the known results are

I increased the Digit, numpoints and also went for high grid size but no luck.

I thought maybe some one  would like to have a look and will help me out.


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