hi @FaizullahShaik, that is the expected behaviour if you have not configured your account aggregation operation to fetch the entitlements also. You are seeing them till the point accout aggregation is run because SailPoint has provisioned the access and the entitlement assignment is completed.
If you do not have an API call to get both user and groups assigned to user in single endpoint call you may have other endpoints that will proivde which user has which groups. If you have those endpoints then you can use parent child account aggregation operations in your webservice source and fetch both the user data and entitlement information. A sample is shared in the connector guide here.