If you move the probes in tighter in the pin-point formation and centre it over the anomaly then you should get a better hit - this is “crtl + mouse wheel” rather than the “alt - mouse wheel” use to change the range. You don’t want them all in exactly the same place as they need to triangulate to the target, but having them all much closer can help.
It’s a pain having lower scanning skills because some anomalies become very hard or slow to nail down.
The probes get a better reading on the location if they are nearer to the target - so it’s a matter of clustering them much more closely together than the normal pinpoint spread. Hopefully that makes sense.
The alternative is train the relevant scanning skills a bit more or go for Sisters launchers and probes (which are a bit expensive for a new player).
If this is a Sleeper site and you’ve not tackled one before then you seriously need to read:
Standard Sleeper Cache - EVE University Wiki as they are tough things with a lot of “made a mis-step and died” potential.