Table headers are blank, cannot show text

[VanguardLH]

Excel 2021 (part of MS Office Pro Plus 2021)
Windows 10 Home x64

I had 2 columns of data. The 1st row was for headers: Date and Reading.
I selected the header row and all of the following rows with data. I
hit Ctrl+T to convert the data into a table. I got the table headers,
and the cell data in the table. The problem is the table header cells
are blank. They don't have "Data" or "Reading", both are blank, and I
cannot edit them to get them to show the header strings. When I click
on a header cell, the string appears in the formula bar, but I cannot
get that string to appear in the table header.

I've even tried converting to a table and NOT selecting the option that
headers are in the selected data range. I can see Column1 and Column 2
in the table headers, but those strings don't appear in the table
headers.

How do I get text to appear in the table's headers? I could select a
range that does not include the header row when converting to a table,
and then hide the table headers, but I should be able to keep the table
headers AND have them show text to title that column in the table.