With the spike and dip I don't think something is likely wrong with your thermometer, but it's a good point to keep in mind. I often get the same temp in several times in a row, but not every cycle. A lot has to do with consistency- consistency of sleep, temp taking time, room temp, stress level, etc. Maybe things have been more consistent lately (minus the emergency)? Are you TTC your first or are you still regulating from a previous pregnancy? The latter certainly could account for more erratic temps that start to normalize more each cycle.
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As for your chart in general I'd say your coverline may not be as accurate as it could be if you had taken more temps earlier on in your cycle. Disregarding CD16's temp, your CL would be around 97.4, keeping that dip on CD24 well above the CL. I would mark CD22 as a disturbed temp and add a note so you remember why that temp is so high. Odd about all the OPK-'s you got, but otherwise, your O spike looks great as does your LP.