The "remove spikes" helps in some cases, but it looks like there are genuine bugs in after hours data handling.
In the attached photos, note how the final candle alternately is dramatically lower and red, and otehrwise "normal", smaller, and green. These three screenshots were captured in sequence. This is a completely routine occurence for me after hours with Tradier.
If somehow this is a Tradier issue, let me know how I could describe it to them, if possible, but I have another platform that does not show this problem (though, ironically, it has others).