the automatic gear box laguna2

I have a laguna 2 model 2002 , the automatic gearbox showed some oil leakage , but it works perfectly . I decided to change the oil sealer and the oil as will. after doing so the car automatic gearbox stopped functioning normally and working only reverse mode. I did computer checking but it showed no thing. could please tell me what went wrong with my gear box.

thank you for your help.

regards
BAKEER

the automatic gear box laguna2