The first thing I would check are the knobs for the oven thermostat and the selector switch.
The knob consists of two pieces: the outer part with the temperature settings (or mode marks on the selector switch knob) and the central piece which goes on the shaft.
If the outer piece got dislodged, then it's very easy to put it back in the wrong position (180 degrees around).
If it happened then the dial reading does not match the real setting.
If this is the issue, assemble the knob in the right way and, using couple drops of a Crazy Glue, attach both pieces together.
Gene.
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