Hi @Anonymous,
Could you please share a screenshot about your app's configuration?
How do you collect your data within your app? Could you please share more details about the formula?
Further, does your Dropdown box connect to a SP list data source within your app?
Based on the screenshot that you provided, I think there is something wrong with the formula that you use to collect your data within your app. In addition, I suppose that you collect a record value from the Dropdown box rather than a specific text value into your collection data.
I have reproduced your issue on my side, please check the following steps:

Within the screen of my app, I add a Drop down control, which is connected to my SP list. If I collect data from the Dropdown control using the following formula:
Collect(
ShoppingCart,
{
Conduit:TextInput1.Text,
Conduit_x0020_Type:Dropdown1.Selected, /* <-- Collect data from Drop down control */
Quantity:TextInput2.Text
}
)
The collection would be shown up as below:

The GIF image as below:
The Dropdown1.Selected formula would return a record (your current selection within the Dropdown box belongs to), so if you want to collect the current selection from the Dropdown box into your collection data, you should reference specific property value.
On my side, I should modify above formula as below:
Collect(
ShoppingCart,
{
Conduit:TextInput1.Text,
Conduit_x0020_Type:Dropdown1.Selected.Value, /* <-- refernece specific property value here */
Quantity:TextInput2.Text
}
)
Then the collection data would show up as below:

Please check if you have provided a record value for the Conduit_x0020_Type (Pipe_x0020_Szie,...) column within your formula. If yes, please take a try to reference a specific property value from the Dropdown box within your Collection formula.
Best regards,
Kris