No worries!
1) The horizontal range is actually going to demonstrate the fraction of bit period attributed to jitter. The x axis is Bit Period, so this accounts for some of your problems. You will need to multiply these numbers by the bit period. For example, your first slide would actually have a jitter of ~0.03 ps. This also explains the change in jitter as you modified the Bit rate.
2) I think you are seeing changes in the jitter as a function of sample rate because the jitter is very low, so as you increased the sample rate it increased sharply.
Regards