OK, forget about calcium. You have a vinyl pool, calcium is therefore not important. For now, ignore Total Alkalinity as well. In fact you may not have to worry about it at all.

The "OK" indicators on strips and some testers are to be ignored. Correct FC levels are absolutely related to the CYA (Stabilizer) level in the water. Strips frequently don't give the same reading as drop tests. Trust the drop test kit first.

For now, only worry about pH, FC and CC levels, and CYA. Nothing else really matters for you (later, you'll know why, but for now let's just stick to these 3).

Carl