Trying to apply Parks-McClellan optimal FIR filter design
There are a few problems with your designs. First, the desired bandwidths and transition bands (between passbands and stopbands) are very narrow. Second, some of the center frequencies are very low, especially the ones at 20/100000 and 300/100000. And finally, your chosen filter length is very large. I do not know the implementation of the Remez exchange algorithm that you use, but I've seen several implementations that run into serious numerical problems for such filter lengths. You can see in your designs that around Nyquist there are some small peaks in the filter response. These are due to numerical problems.

So you should try to make the passband and the transition bands a bit wider and reduce the filter length to see if you can get a reasonable design. From there you could try to make the specifications a bit more stringent and increase the filter order and see how far you can go.

In Octave, the following specification gives a reasonable result (center frequency: 0.1, filter length: 300, '1' corresponds to Nyquist):

h=remez(300,[0,.07,.085,.115,.13,1],[0,0,1,1,0,0]);