Avtm smart card
Mistake in deduction of balance

I am using avtm card. Since long time. I recharged on 27 april for rs. 100. My total bal was 55cf 100 recharge value 5bonus value=160/-

Afyer that i. Travelled to

shahad 16/- on 28 april

vt. 18/- on 10 may

vt. 18/- on 19 may

Vt. 18/-

Total comes to 70/-

160-70=90

The balance shuld be 90 but it only shows 65. Why 25 rs. Is les please give me details. Thank you