RadzenDropDown not filtering as you type

Good Day. I am new to Blazor and Radzen components. I have taken over some code written by another developer. He built some dropdowns that get its data from a database query. The query works fine when you enter the minimum amount of characters. The problem is you have to leave the dropdown and go back in or press enter and go back in for the filtered list to populate. What could be the issue. This is not very user friendly and there is a form with multiple dropdowns.

<RadzenDropDown @bind-Value=Cities TValue="CitiesListResult" Name="Cities" AllowFiltering=true FilterCaseSensitivity="FilterCaseSensitivity.CaseInsensitive" Data="@Cities" AllowClear="true" TextAlign="TextAlign.Left" TextProperty="CitiesListDesc" LoadData="e => LoadCitiesData(e)" Change="OnComponentChange" />

I'm afraid that we cannot tell what's causing the problem just by looking at this code. Try to replicate your case in our demos - they are editable.