It first detects pipetting sequences in the worklist and then assigns each sequence to a tip for pipetting. When each A;A;D;F; was recognized as one pipetting sequence, it will do it with the same tip, hence aspirate from A4 and B4 with the same tip.
Perhaps like the following to aspirate twice in a row from the same well?
A;wellplate96[001];;;A4;;50;;;;
A;wellplate96[001];;;A4;;50;;;;
D;waste;;;A1;;100;;;;
F;
A;wellplate96[001];;;B4;;50;;;;
A;wellplate96[001];;;B4;;50;;;;
D;waste;;;A1;;100;;;;
F;
etc…