Problem with the pipe tool & boolean when joining curves?

Hello Im new to Rhino (and designing in general), I'm wondering if this could be a bug or if anybody else is having this problem that I keep running into.

I have a curve that when I use the pipe tool on looks good.
Then when I take that same curve and join it with other other curves the pipe tool doesn't seem to work on that same section that it previously worked? So then I tried to take the pipe as a poly and boolean union with the other section of pipe. and the boolean function wont work.

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