I would say that because your levels (no2,no3,nh4) i starting to drop back down to zero that it why your Ph has stabilized and started t climb. Your system maybe starting to use the carbonates for coralline algae growth. As wasp said your levels are fine, and like reef said just do a good water change to bring it back up.
I would also say that your test for alk was in Meq's as DKH test kits do not measure in .3's and .5's , but rather in whole numbers. If your test is in meq's again those readings are normall.
HTH
Ben