Hi Shradha,
You may check below note and see if this helps.
1772537 - Negative values of buffer statistic data
710000 - ST02: Negative sizes for the roll/paging file
You may further refer below note and see if this helps.
1572499 - Negative values in performance MTE R3PagingSizeKB
If you see above notes, sometimes the issues were with configuration and sometimes with defects.
A quick workaround is some adjustment of memory parameters, as per you HP-UX(RISC/Itanium) type.
Other is you should upgrade kernel to new release with latest patch.
Move to a release that is supported by SAP and your environment,also apply it's latest patch.
In both cases, incorrect configuration will result in incorrect values.
After doing all, you still feel all is fine, then please raise it with SAP, and get the solution.
I hope that help us.
Regards,
Divyanshu