How can I remove the red line?

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I just used the function plot_model (package: sjPlot) and "ci.lvl = NA" to remove the red lines and add instead the three black ones with "geom_lines". Usually it works perfectly, but as you can see in fig. 1 there is sometimes still a small part of the red line left. How can I remove this one?

Example:

#model lmer

Jitter_Mikro_temporal<-lmer(cyano~pH
                   +(1|month)+
                     (1|StationID),
                   data=count_all)
summary(Jitter_Mikro_temporal)

#base

plot<-plot_model(Jitter_Mikro_temporal, type = "pred", terms = c("pH"),title="Microscopy", size=6, ci.lvl=NA)
plot.incl.full.SID
fig.incl.full.SID<-plot.incl.full.SID+theme_bw()+
  ylab(expression("Cyanobacteria [%]"))+
  xlab("pH")+
geom_jitter(data=count_all,aes
(x=pH,y=cyano,col=StationID),size=.1,alpha=1)

#second plot on top of first one

fig.pH.2<- fig.incl.full.SID +theme_bw()+
  ylab(expression("Cyanobacteria [%]"))+
  xlab("pH")+
  xlim(7,9)+ 
geom_jitter(data=count_all,
aes(x=pH,y=cyano,col=StationID),size=.1,alpha=1)

#remove red lines, instead black ones:

raw.1.micro<-fig.pH.2+
  geom_line(data=pH_K, aes(x=pH, y=fit), color="black",size=1.5)+
  geom_line(data=pH_K, aes(x=pH, y=lower), color="black",size=1, linetype=2)+ 
  geom_line(data=pH_K, aes(x=pH, y=upper), color="black",size=1, linetype=2)

raw.1.micro

Part of the data: dput(Jitter_Mikro_temporal)

Scaled residuals: 
    Min      1Q  Median      3Q     Max 
-3.1299 -0.2447 -0.1149  0.0564  5.5750 

Random effects:
 Groups    Name        Variance Std.Dev.
 month     (Intercept) 74.194   8.614   
 StationID (Intercept)  5.507   2.347   
 Residual              63.855   7.991   
Number of obs: 99, groups:  month, 12; StationID, 4

Fixed effects:
            Estimate Std. Error     df t value Pr(>|t|)  
(Intercept)    85.73      33.02  88.92   2.597   0.0110 *
pH            -10.30       4.09  87.91  -2.519   0.0136 *
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Correlation of Fixed Effects:
   (Intr)
pH -0.996

dput(count_all[1:50,])

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