[poppler] Weird rendering of a very simple pdf

[Albert Astals Cid]

I've stumbled upon this simple pdf

BT
/F1 9 Tf
1 0 0 1 55 763 Tm
0 0 0 rg
51 775 497 1 re
B
(DADOS DO VOUCHER)Tj
1 1 1 RG
50 760 500 13 re
0.72549 0.83137 0.9451 rg
B
/F2 9 Tf
1 0 0 1 55 750 Tm
0 0 0 rg
(Nº Voucher: )Tj
1 1 1 RG
50 747 500 13 re
0.86667 0.91373 0.97255 rg
B
ET

That renders correctly in Adobe Reader but not in poppler based files.

Any clue why?

Cheers,
  Albert