Label Values Cut Short in PROC SGPLOT

[banderson2112]

proc format library=work;
value $Serving
'RN' = 'Nadal'
'RF' = 'Federer'
'ND'  = 'Djokovic'
'JI' = 'Isner'
;
run ;

*Lets combine the four datasets ;
data goats_isner ;
set isner_serve rafa_serve fed_serve djoker_serve ;
format Serving $Serving. ;
run ;

*Compare the four rallylen in one chart-fix format! ;
proc sgpanel data=goats_isner ;
panelby year ;
histogram rallylen / group=serving  dataskin=matte transparency=0.5 ;
label rallylen = "Rally Length" ;
keylegend / valueattrs = (Size=8) ;
title "Rally Length on Serve" ;
run ;

My code is above with some output of the data below along with the generated plot. I got marked for spam but I am genuinely stuck on this. The output is cutting short on the legend labels to 4 characters but it reads in fine using the format I created so I am not sure why that is happening. I get "fede" instead of the entire "Federer" as I coded in the plot but my dataset reads it correctly So I am not sure why this is the case. 

Am a newbie here so I apologize for any lack of clarity in my post

[Jagadishkatam]

/*moved the format $seving on serving variable from data step to proc sgpanel*/

proc format library=work;
value $Serving
'RN' = 'Nadal'
'RF' = 'Federer'
'ND'  = 'Djokovic'
'JI' = 'Isner'
;
run ;

*Lets combine the four datasets ;
data goats_isner ;
set isner_serve rafa_serve fed_serve djoker_serve ;

run ;

*Compare the four rallylen in one chart-fix format! ;
proc sgpanel data=goats_isner ;
panelby year ;
histogram rallylen / group=serving  dataskin=matte transparency=0.5 ;
label rallylen = "Rally Length" ;
keylegend / valueattrs = (Size=8) ;
format serving $serving.;
title "Rally Length on Serve" ;
run ;

[banderson2112]

Thanks Jag, I tried that earlier and just now and it still yields the same result unfortunately so it doesnt work

[PaigeMiller · Accepted solution]

I am unable to open your attachments. I don't know if you did something wrong or my firewall is blocking them.

[banderson2112]

PlotPart of dataset GOATS_ISNER

Hope this helps, sorry about that they are working for me

[banderson2112]

I figured it out! Needed to change the length of the variable in the GOATS_ISNER dataset prior to using the '$Serving' format afterwards. Appreciate the help!