I have a doubt regarding the following picture.

Here the first figure shows different frequency analog signals sampled at different frequencies leading to same digital signals,which I assume is due to aliasing effect in the second signal the original frequency is changed.

But when it comes to the second example,same analog signals sampled at different sampling frequencies happen to look like there is a phase shift,if it is a phase shift , may I know how did it happen as the sampling frequency changed?

Thank You In Advance

Krishnapriya