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It looks like the leak is at the threads where it goes into the other fitting (and not where the tubing goes into the fitting) you can release the tubing then unscrew the fitting. Clean the threads, reseal using either teflon tape or teflon goo then reinstall the fitting and tubing. But if you have a compression fitting I'd use that.
Also that black tubing on the left side of your first picture looks like it is in a bind. You might try to either extend the tubing to get some strain relief where it goes into the fitting or rotate that fitting a bit so it is in line with the tubing.

I'll take a look at those threads and thank you for the tip on that other 1/4 tubing.  It for sure needs to be longer and since it as not leaking this fool wouldn't have thought of giving it a little relief. I should have also taken a better picture of the yellow with the push fittings right after I soaped it up as there was definitely a significant leak a the push fitting so I'll be swapping those out to compression.