2 indeterminate syphillis screenings, no result for rpr test, urinalysis showed 2+ protein. Is there any correlation between these lab results??

No. Ask your DR, or whoever ordered the tests to coordinate with your history and symptoms.
Options for testing. RPR is one way to test. There are others VDRL, TPA (alteplase) and FT-ABS are better ways. Syphilis testing can be confusing but your doctor should be able to guide you through your specific results.