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If your food is unevenly heated it's probably because you need to adjust the cook time and power settings. Heating it longer at a lower power setting will let the heat spread more evenly.
Alternatively, check your microwave's wattage. I always have to adjust microwave instructions to be about 10% longer because my apartment's microwave is weaker than companies assume the standard microwave is.
✨ May better heated microwave food await you ✨
Yeah, once I started playing with power level settings, it was like night and day with cooking in the microwave.
tl;dr: skill issue
Except the food has localized concentrations of oil, fat or water or differences on overall density.
That's why you lower the power. Leave enough time for entropy to distribute the heat before dumping more energy into the food. The more heterogenous the food is, the more you need to lower the power (down to maybe even 200-400 W for mixed leftovers). And make sure all your foodstuffs are touching each other to allow heat to homogenize.