Can you try this please:
| eval Error = if(test1 > 2,1,0) | eval Erreur = if(test2 > 2,1,0)
| stats count as TOTAL, sum(Erreur) as Erreur_test1, sum(Error) as Error_test2
| eval perc_err_test1 = round((Erreur_test1 / TOTAL) * 100,2)."%" , perc_err_test2 =round( (Error_test2 / TOTAL) * 100,2)."%"
OR if you want use subtr command:
| eval Error = if(test1 > 2,1,0) | eval Erreur = if(test2 > 2,1,0)
| stats count as TOTAL, sum(Erreur) as Erreur_test1, sum(Error) as Error_test2
| eval perc_err_test1 =(Erreur_test1 / TOTAL) * 100,2) , perc_err_test2 =(Error_test2 / TOTAL) * 100,2)
| eval perc_err_test1=substr(perc_err_test1,1,5)."%", perc_err_test2=substr(perc_err_test2,1,5)."%"
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