Sort failing on service backed record

I have a entity-backed record, with sorting applied on Transaction Id. While sortinfo is on date field.

Sort is not working as expected.

When i first land on the page, sorting on descending as expected.

When i click on next button to get next 25 records, getting data starting from 26 - rest.

Again if i click back icon, seeing records from 1-25 instead but not the data form screenshot-1. 

Any suggestions please?

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