For the third time i have the same question . Experts help !

Whats wrong with the leafs ?

First two pics are from one plant , second two pics from another !
My plants are in flowering for one week .
Temperature : around 20-23 C !
Humidity : 45 - 55 %
Normal mix soil for balcony flowers .
PH : I don't have PH meter so i measure it with litmus paper !
Around 7 !
DreamerGirl7 Reviewed by DreamerGirl7 on . Flowering problems ! ! For the third time i have the same question . Experts help ! Whats wrong with the leafs ? First two pics are from one plant , second two pics from another ! My plants are in flowering for one week . Temperature : around 20-23 C ! Humidity : 45 - 55 % Normal mix soil for balcony flowers . PH : I don't have PH meter so i measure it with litmus paper ! Rating: 5