I would suggest 10nF, directly between the top of L1 and the bottom of C5..
You do perhaps a construction fault while wrapping the inductor ?I tried to measure the L directly, it's confirmed that L value is more than double what I calculated by inductor tool. So the frequency calculation is correct.
I tried some of other calculation website, it shows correctly with the tool.
https://www.rfcafe.com/references/electrical/inductance.htm
https://www.66pacific.com/calculators/coil_calc.aspx
Anyone has any idea why the inductor tool give the wrong value?
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