Last xlabel in successive subplots

Hi everyone,

I did not manage to solve why the xlabel of the third (bottom) subplot is incorrect in the attached graphic function code, any help appreciated to explain the behaviour that is not displaying correctly t[s] in figure 0 (bottom subplot), while it is correct in figure 1, corresponding to call to the attached function :

bgvisuseq("dummy")  //not correct xlabel
bgvisuseq("") // correct xlabel

bgvisuseq.sci (2.0 KB)

Thank you,

David