Using Azure search in Sitecore 9.1.1. We are getting extra results in Azure search only, with Solr results are showing correctly.

Scenario: 

Fetching result from the below structure :

[![enter image description here][1]][1]

When we try to fetch result by passing ```1999``` in Azure search then it shows result for ```Data 1999``` folder as well.
If we pass ```1998``` then result shows for ```1998``` only. 

Issue with ```1999``` only even when we pass ```Data 1999``` result shows correctly.

Getting result while passing ```1999``` in Azure search:

    Test 1
    Test 2
    Test 3

Instead of 

    Test 1
    Test 2

  [1]: https://i.sstatic.net/R8N0L.png