Did you only charge it to 20% capacity rather than 100%? If so, that is not good practice, as well as being impractical. Battery experts on these forums have taught me to recharge when the battery has discharged to no lower than about 40%, and I trust them.
The app percentages look normal enough, and the screen-on time actually looks quite good starting from that 20% charge. A discharge to 6% with that much use in that much time seems okay to me....but again I don't see why you did not charge fully.
The mobile signal is not the best, which will tend to use battery, although I don't know that it would cause overheating. Could you charge to 100%, use normally, and post more stats as above?
Try turning mobile data off for a while and see whether the overheating stops. That signal looks abnormal to me.
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