Needed clarification in Transient Dynamic analysis (DTRAN) with acceleration

Hi everyone,

I'm trying to simulate "Transient Dynamic analysis (DTRAN) with acceleration.
Displacement output is looking different as below,

Acceleration output plot from Input nodal point which is same as Input data as below

Input data from TABLED1

Displacement output plot from Input nodal point .

This makes confusion. couldn't identify the root cause.

Please have a look at it and let me know your suggestions/comments/experience.

Thanks you,
John.