Tube and Pipe error with welded pipe/fittings

[JBEDsol]

I keep getting this warning but w/ components that as far as I can tell match just fine.  

[JBEDsol]

To clarify, I get these warnings despite not having any threaded pipe or fittings

[johnsonshiue]

Hi! It sounds like a corruption to me. Please share the example files here. I would like to understand the behavior better.

Many thanks!