I discovered this issue. I was trying to build a custom sort by using a calculated SharePoint column.
Discovered sorting issue In Power Apps with 1, 10, sort problem when I really wanted. 1,2,3...9, 10, 11.
Since I had only 15 categories, I switched to letters. Side-stepped this problem.
=IF(SharePoint Column="Field","A",
IF(SharePoint Column="Field","B",
IF(SharePoint Column="Field","C",
IF(SharePoint Column="Field","D",
IF(SharePoint Column="Field","E",
IF(SharePoint Column="Field","F",
IF(SharePoint Column="Field","G",
IF(SharePoint Column="Field","H",
IF(SharePoint Column="Field","I",
IF(SharePoint Column="Field","J",
IF(SharePoint Column="Field","K",
IF(SharePoint Column="Field","L",
IF(SharePoint Column="Field","M",
IF(SharePoint Column="Field","N",
IF(SharePoint Column="Field","O"))))))))))))))