Any chance you could upload a packaged workbook so we can see what's happening?
I suspect it is the commas, could try switching to using a dot for decimal places?
Latitude lines range between -90 and +90 degrees and longitude coordinates are between -180 and +180 degrees. Your numbers are out of the limit due to commas. It should be real numbers. Also, in schema.ini file make sure you're mentioning data type as double.
You might just need to change the geographic type of those columns to Latitude and Longitude. I'm not sure why Tableau didn't pick them up automatically, but you can assign them yourself.