There are several possibilities, you need to locate the leak, Also I think you have described two problems.
First: "It only shows 1/4 full but when I try to add more it comes out" (Parapharsed) Bad sensors. Somewhere on the water tank, likely where you can see it there are 4 wires, hooked to 4 studs. It may be that 2 of these wires are broken (Note, no guarentee there are just 4, might be five or more) If so, a simple splice will get your sensors working again, Same color to same color.
These wires then go to a small plastic "Block" which contains electronics, That might be bad
And then a single wire goes to your display panel, which may have problems
And that lights the lights, which may be bad (Really LED's)
I'm listing all possible issues more or less in order of likelihood. LED's almost never go bad in this kind of service
Now the second problem, the leak in the "Wet" bay (So called cause it has the plumbing in it)
Is this water spurting out the city fill fitting? If so remove the screen and you will see an "insert" which has a button like center press and release, Some folks say turn pump off first so there is no pressure, I'm not sure that is necessary but then I've not had that problem.
Is it s slow drip? There is a lot of plumbing behind that panel, and a pair of quick disconnect fittings (They are screw on but smaller than a garden hose) They are supposed to be hand tightened.. Mine were not all that tight, and one (at least) was dirpping, There are many connections back there and one or more may be in need of tightening. I tighetned several about a month ago and after doing that (And replacing one short run which froze and broke on the way here) I checked and saw something under the wet bay I'd never seen before EVER, when pressurized.
Dry ground
No leaks
Not a one
Period
This rig leaked from day one till 12/4/2006 (When I tightened the last leaking fitting)