Is it ok if I sweat copper pipe into an elbow but the pipe couldn't reach the stop in the elbow? Basically, I build a copper cold water manifold and was unable to get the copper elbow all the way inserted into a copper stub out. It is probably inserted about 1/2" - 5/8 but I dont think it reached the stop. Will I have leaks? If i dont have leaks when I turn the water main on, is it possible to get leaks in the future?

I just installed a softener and whole house filter. I tapped into the main pipe coming from my well. All the joints are fine except 1. I have copper piping then I connected a piece of flex hose that runs to the softener. Where I screw the mailers end ofthe flex hose to the female end of the copper pipe is a small leak. I took it apart reapplied teflon tape screwed it back in and it leaked. I replace the flex house with a new one tefloned it again and about 15 minutes later small drops of water appeared and it started leaking. I am using the same flex pipe on the other side of the softener and no leaks. What the heck is wrong? What did I miss or how can I fix it? I wanted to include a picture but there doesn't seem to be away to attach while using my phone Your help is greatly appreciated in advance.