Strange problem when writing xsf files

V.7.3 of pp.x misses some atomic symbols when writing xsf files. Did not happen with v.7.2. See the charge density files produced by the attached script (courtesy Francesco Filippone, ISM-CNR) run_Difenolo.vdW.paw.debug_intel

 CRYSTAL
 PRIMVEC
   21.167088436    0.000000000    0.000000000
    0.000000000   21.167088436    0.000000000
    0.000000000    0.000000000   21.167088436
 PRIMCOORD
          26           1
         10.908655945    9.625832753   10.740159015
C        11.532675996    7.363010190   10.505151997
C        10.523715811    8.328146575   10.587188147
C         8.857779008    6.596454911   10.353076677
C         9.181564722    7.942723316   10.511929761
C        11.195179296    6.023028711   10.346407746
C         9.858019463    5.629093109   10.269888751
O        10.138895743   10.237687764   10.737073235
O         9.600180708    4.575260364   10.140355082
O        11.989456159    5.274732722   10.278646012
O         7.806560741    6.302163756   10.295946466
O         8.394214097    8.701677346   10.576000435
O        12.575345928    7.685504843   10.564690916
          9.430513229   12.041305771   10.715423975
C         9.925325043   14.404801671   10.487616548
C        10.339509389   13.078754280   10.610884228
C        12.636857066   13.770706914   10.515313405
C        11.695137193   12.751951401   10.628944211
C        10.881578366   15.413324309   10.373411915
C        12.239624592   15.101717788   10.385617955
O         8.524382299   12.397211379   10.663556403
O        12.987491848   15.892382252   10.289591159
O        10.557513415   16.452513010   10.271624703
O        13.699688069   13.514241939   10.525452150
O        11.997014522   11.707025212   10.723913693
O         8.857541342   14.650712236   10.479407006
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