Income tax return filing ay 2017-18

TDS as per 26 AS appears to be different from the TDS appearing in Income tax return I form schedule.Cannot pre-view and submit.There is direction to add additional TDS amounts in the schedule.However messages appear that there are invalid characters input both before adding additional TDS and also after adding Additional TDs as per 26 AS.TDS as per 26 AS is higher than the figyre shown by ITRI schedule.Please advise .