Edit: The issue has been solved. Thanks.
Hi All,
I have created an app that combines two separate data sources to store responses from my team, but the gallery is not presenting the text from submission. The gallery sorts the responses based on set criteria, and it is showing the correct amount of submissions, but no text is connected to it. As seen below, the items are there, but there is nothing showing. The error messages both say: Error when trying to retrieve data from the network: The query is not valid. clientRequestId: d358bd10-a390-47ea-a353-d50a9917b13f serviceRequestId: ae94daa1-40ef-a000-8a88-7231afb0a633. For reference, the Items property for the box is "ThisItem.Title" in which Title is the name of the column in the SharePoint data source.

Does anyone have any advice on how to resolve this issue? TIA.