Output of oscillator expected to be square wave, but looks sinusoidal

I've build a circuit exactly like the one below except Im using a SN74HC14N (schmitt triggered inverter).

The output of the circuit looks like this, however isnt it supposed to be more square wave looking? I've tried feeding the output to another schmitt triggered not gate but the output stays the same. Anyway to get a more square wave looking output?

Also when I used non schmitt triggered not gates there was no output at all. All the gates im using are TTL. The crystal is 8mhz, and my oscilloscope goes up to 100mhz

There is a similar question. However, my oscillator is based on a pierce circuit

Edit: Here is what I get when I set the probe to 10x, I guess this is acceptable? even if it spikes?