You can have symptoms of deficiencies and the burn at the same time if your watering is off. Meaning you need to have some runoff every time you water and you can't let the plant re uptake that runoff. The other thing is in soil its best to water in a little bit wait, water in a little bit wait, water in a little bit and wait until you get a nice run off and then not let that run off reuptake.
Close ups of your concerns would help.