To fix alignment issues in certificate,
Check whether if there's any extra space between the learner name & course name. If there's any, reduce the unwanted space.Make sure to give parameters for certificates in the proper format. Format for parameters are
a) Learner name - {Name}
b) Course name - {Course_name}
c) Date - {dd-mm-yyyy}
d) Percentage - {Percentage}
e) Grade - {Grade}
3. Rewrite the parameters again if this issue still arises.