Help using Base SAS procedures

Graphs (dotted line)

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Graphs (dotted line)

I am creating overlay plots and one is a dotted line from 1 to 1 in the graph I have the exact same code for all of my graphs and have checked the data to make sure it is the same but the dot sopacing in these lines are different for some reason. Some of the dots are closer than others yet I am running the same code.
Here is my code example

goptions reset=all;
options nobyline orientation=portrait;
goptions cby=green ftext='swiss' htext=50pt xpixels=1800 ypixels=1500;
symbol1 v=none i=join width=3 c=black height=2 line=1;
symbol2 v=dot i=none width=3 c=black height=2 line=0;
symbol3 v=none i=join width=3 c=black height=2 line=3;
axis1 label= (a=90 r=0 F='swiss' height=60pt '[OxPt]/IC') order=0 to 1.5 by .5 major=(H=1)minor=none /*(number=5 H=1*/ width=2 ;
axis2 label= (F='swiss' height=60pt '[DENSPM]/IC') order=0 to 1.5 by .5 major=(H=1)minor=none /*(number=5 H=1*/ width=2 ;
axis3 label= (a=90 r=0 F='swiss' height=60pt '[CsPt]/IC') order=0 to 1.5 by .5 major=(H=1)minor=none /*(number=5 H=1*/ width=2 ;
run;

(graph 1)
/*A2780 OxPt*/
proc sort data=oxa2780;
by cell ind Bconc10;
run;
filename grafout "Z:\PKPD\PKPDShared\oxali_denspm\graphs\isobolograms\RD_IC10_A2780_OxPt+DSP.gif";
goptions device=gif373 gsfname=grafout gsfmode=replace xpixels=1800 ypixels=1500;
proc gplot data=oxa2780;
title1 move=(51,27) height=65pt 'IC' move=(53.75,26.5) height=45pt '10';
title2 move=(43,.5) height=45pt 'X'; /*horizontal x*/
title3 a=90 move=(5,21.5) height=45pt 'X'; /*vertical x*/
plot Aconc10* Bconc10
aconc10no1*bconc10no1
Aconc0*Bconc0
/overlay vaxis=axis1 haxis=axis2;
by cell ind;
run;
quit;

(graph2)
proc sort data=oxa2780;
by cell ind Bconc25;
run;
filename grafout "Z:\PKPD\PKPDShared\oxali_denspm\graphs\isobolograms\RD_IC25_A2780_OxPt+DSP.gif";
goptions device=gif373 gsfname=grafout gsfmode=replace xpixels=1800 ypixels=1500;
proc gplot data=oxa2780;
title1 move=(51,27) height=65pt 'IC' move=(53.75,26.5) height=45pt '25';
title2 move=(43,.5) height=45pt 'X'; /*horizontal x*/
title3 a=90 move=(5,21.5) height=45pt 'X'; /*vertical x*/
plot Aconc25* Bconc25
aconc25no1*bconc25no1
Aconc0*Bconc0
/overlay vaxis=axis1 haxis=axis2;
by cell ind;
run;
quit;

the dotted lines in both are different length dots, has anyone else had this happen or know how to fix it?

Thanks!!!
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