I'd guess you have got a low range pH test kit and a high range pH test kit. My low range test kit for pH will measure the pH 'accurately' between 6.0 and 7.6. The high range pH kit measures between pH 7.4 to 8.8. Yours may have a different range depending on the brand.
So for example if your water has a true pH of 8.0, then the low range pH test kit will show that as a pH of 7.6 because it cannot read a pH higher than that. The high range pH test kit (in this example) should show the accurate reading. Have a look at the box the pH test kits came in and that should tell you the range of pH each should read.
As to your ammonia, nitrite and nitrate readings, to me it's looking good. Your 'cycling' of the tank is underway. Keep testing the ammonia, nitrite and nitrate every day or other day. What you should see happen is the value for the ammonia will increase and then decrease to zero. The same should happen for the nitrite, though a bit after the ammonia (a little like it's lagging a bit behind), finally the nitrate reading will keep on increasing. When your ammonia and nitrite readings reach zero, your tank is cycled. You will need to perform some water changes to lower your nitrate (this will become part of your regular tank maintenance). The (fingers crossed) your tank is ready for it's first fish.
There is probably a good link in the FAQ about cycling a tank and it would be worth rooting it out and having a good read.
Good luck,
Triskele