Thermostat code

Using Arduino Programming Questions
3

I modified the code to this:

int readingP,readingS;
  
  lcd.setCursor(0,0);
  
  readingP=analogRead(5);
  fine=((30*readingP)/1024); //calculating the desired temp.
  lcd.print("Temp finale:");  //printing it on lcd and serial monitor
  lcd.setCursor(14,0);
  lcd.print(fine);
  
  Serial.print("Temp finale:");
  Serial.println(fine);
  
  lcd.setCursor(0, 2);
  
  lcd.print("Temp:");
  Serial.print("Temp attuale:");
  readingS=analogRead(0);
  temp=(5.0 * readingS * 100.0) / 1024; //calculating the actual temp.
  lcd.setCursor(11,2);
  lcd.print(temp);
  Serial.println(temp);

,but it still gives that problem.
I even tried printing the single readings without processing them,and yeah the sensor one is affected by the pot.
Could it be due to a little short I made for mistake the other day? It lasted 1-2 seconds though,and everything else works fine anyway,so I actually don't think it's that..but I just can't figure out what's not working.