I am using a User Custom Control that contains 3 DDLs, Country, City and Hotel respectively.

When I am selecting values, everything works fine. However, after I postback the page, 3/10 times, the 3rd DDL, losses its values.

Using Fiddler I found out that the calls to web service are theese:

Countries, Hotels, Cities, Hotels. First time Hotels is called, returns single value (Please select City)

The 2nd time, it returns all the data. 

I had to isolate this control to an empty project. A page, with the control only. After many retries, it seemed to work 100%.

However, When I am using in inside DNN.4.8.x, I am experiencing this problem... Even though it returns the data, Hotels DDL, remains empty, and I have to change Cities value in order to fill it.

Please notice that this happens only after a postback, where it should remember the selected values.