I have the following data: "ani_vs_16s.csv"
P_graminis_DSM_15220 P_jilunlii_ATCC_23019 93.02 99.2
P_graminis_DSM_15220 P_polymyxa_ATCC_842 69.03 94.5
P_jilunlii_ATCC_23019 P_polymyxa_ATCC_842 68.86 94.5
P_graminis_DSM_15220 P_riograndensis_SBR5 91.76 99
P_jilunlii_ATCC_23019 P_riograndensis_SBR5 92.76 98.5
P_polymyxa_ATCC_842 P_riograndensis_SBR5 68.57 94.2
P_graminis_DSM_15220 P_sonchi_X19-5 92.06 99.1
P_jilunlii_ATCC_23019 P_sonchi_X19-5 93.31 99.2
P_polymyxa_ATCC_842 P_sonchi_X19-5 68.88 94.8
P_riograndensis_SBR5 P_sonchi_X19-5 96.09 99
P_graminis_DSM_15220 P_sp._CAR114 91.38 99.4
P_jilunlii_ATCC_23019 P_sp._CAR114 92.45 99.3
P_polymyxa_ATCC_842 P_sp._CAR114 68.61 94.5
P_riograndensis_SBR5 P_sp._CAR114 96.31 99.2
P_sonchi_X19-5 P_sp._CAR114 95.61 99.4
P_graminis_DSM_15220 P_sp._CAS34 91.84 99.5
P_jilunlii_ATCC_23019 P_sp._CAS34 92.91 99
P_polymyxa_ATCC_842 P_sp._CAS34 68.63 94.7
P_riograndensis_SBR5 P_sp._CAS34 97.01 99.3
P_sonchi_X19-5 P_sp._CAS34 96.32 99.6
P_sp._CAR114 P_sp._CAS34 97.7 99.7
When I plot this points with gnuplot, an extra point appears on the plot (blue arrow). The table has 21 points, but 22 points are shown in the plot (note that there are 6 points in the lower left side of the plot).

I checked the data, but I was not able to find the problem. When I plot with LibreOffice Calc, no extra point appears. Is there some problem in my code?
set terminal svg
set output “ani_vs_16S.svg”
set style rect fc lt -1 fs solid 0.15 noborder
set object rect from 95, graph 0 to 100, graph 1
set arrow from 0,98.5 to 100,98.5 nohead lw 8
plot "ani_vs_16s.csv" using 3:4 with points pt 7 ps 1